Talk:Sun: Difference between revisions

Browse history interactively ← Previous editContent deleted Content addedVisual WikitextInline

Revision as of 06:33, 30 May 2009 editJack Merridew (talk \| contribs)34,837 edits →Should the title be "Sun" or "Earth's Sun": +Talk:Moon#Should the title be "Moon" or "Earth's Moon"← Previous edit		Latest revision as of 18:01, 3 January 2025 edit undo50.127.5.36 (talk) →How does this work?: ReplyTags: Mobile edit Mobile web edit Reply
Line 1:		Line 1:
			{{Skip to talk}}
	{{ArticleHistory
			{{Talk header}}
	\|action1=FAC
			{{Article history\|action1=FAC
	\|action1date=19:43, 26 February 2006		\|action1date=19:43, 26 February 2006
	\|action1link=Misplaced Pages:Featured article candidates/Sun		\|action1link=Misplaced Pages:Featured article candidates/Sun
Line 8:		Line 9:
	\|action2=FTC		\|action2=FTC
	\|action2date=22:45, 15 October 2006		\|action2date=22:45, 15 October 2006
	\|action2link=Misplaced Pages:Featured topic candidates/Solar System		\|action2link=Misplaced Pages:Featured topic candidates/Solar System/archive1
	\|action2result=promoted		\|action2result=promoted
	\|action2oldid=81677488		\|action2oldid=81677488

			\|action3=FAR
			\|action3date=00:41, 30 July 2009
			\|action3link=Misplaced Pages:Featured article review/Sun/archive1
			\|action3result=kept
			\|action3oldid=304745584

			\| action4 = FTR
			\| action4date = 00:27, 13 June 2021 (UTC)
			\| action4link = Misplaced Pages:Featured topic removal candidates/Solar System/archive1
			\| action4result = removed

			\| action5 = FTC
			\| action5date = 09:39, 20 June 2022 (UTC)
			\| action5link = Misplaced Pages:Featured and good topic candidates/Solar system/archive1
			\| action5result = promoted
			\|ftname=Solar System

	\|maindate=March 20, 2006		\|maindate=March 20, 2006
	\|ftname=Solar System
	\|currentstatus=FA		\|currentstatus=FA
			\|action6 = FAR
			\|action6date = 2024-11-02
			\|action6link = Misplaced Pages:Featured article review/Sun/archive2
			\|action6result = kept
			\|action6oldid = 1254894033
	}}		}}
			{{WikiProject banner shell\|class=FA\|vital=yes\|1=
	{{WikiProjectBannerShell\|1=
	{{~~physics\|class=FA~~\|importance=Top~~\|nested=yes~~}}		{{WikiProject Physics\|importance=Top}}
	{{~~WPSpace~~\|~~class~~=FA\|importance=Top		{{WikiProject Astronomy\|importance=Top\|object=yes\|solar_system=yes\|ss-importance=Top}}
			{{WikiProject Weather\|importance=Low \|space-weather-task-force=yes}}
	<!-- Related projects -->
			{{WikiProject Spoken Misplaced Pages}}
	\|astronomy=yes
	\|astro_object=yes
	\|solar_system=yes
	\|SS-importance=Top
	\|Astronomy-importance=Top
	\|space_exploration=yes
	<!-- Project importance ratings -->
	\|space_exploration-importance=Mid
	\|nested=yes
	}}		}}
			{{User:MiszaBot/config
			\|archiveheader = {{tan}}
			\|maxarchivesize = 100K
			\|counter = 10
			\|minthreadsleft = 2
			\|algo = old(90d)
			\|archive = Talk:Sun/Archive %(counter)d
	}}		}}
			{{Annual readership}}
	{{WP1.0\|v0.5=pass\|class=FA\|importance=Top\|category=Natsci\|core=yes\|VA=yes}}
	{{archive box\|auto=yes}}
	<!-- Put new messages at bottom. -->		<!-- Put new messages at bottom. -->

			== Unsafe conclusion in Motion and location ==
	== Sun or The Sun ==

	I'm sure that the Sun's astronomic name is not "the Sun", but merely Sun, as it is simply the local star in our solar system (we don't call Sirius The Sirius and we don't call Alpheratz the Alpheratz).

	If what I'm saying makes sense, than this article requires some editing. <span style="font-size: smaller;" class="autosigned">—Preceding ] comment added by ] (]) 15:19, 25 April 2009 (UTC)</span><!-- Template:UnsignedIP --> <!--Autosigned by SineBot-->

	Hi, my first edit so sorry if I've done it wrong.
	"The Sun (Latin: Sol), a yellow dwarf, is the star at the center of the Solar System."
	Shouldn't this read "the center of "our" Solar System?

	== Peace ==

	We are all children of the sun, we all came out of the sun so why do we fight? We all came from one source. <span style="font-size: smaller;" class="autosigned">—Preceding ] comment added by ] (]) 21:47, 8 October 2008 (UTC)</span><!-- Template:UnsignedIP --> <!--Autosigned by SineBot-->

	: Well, here's your ticket back. Bon yoyage! ] (]) 01:59, 26 December 2008 (UTC)

	: Make a wish and send it to the sun. You can only use it for good ;) <small><span class="autosigned">—Preceding ] comment added by ] (] • ]) 05:19, 1 February 2009 (UTC)</span></small><!-- Template:Unsigned --> <!--Autosigned by SineBot-->

	== Extent of hydrogen/helium ionization ==

	I'm in astro 320 at U of Alberta (MT tomorrow :)) and I am confused about the reason why hydrogen is ~100% ionized in Sun's core (T = 1.5710^7 K; ref. my assignment). To calculate N(II)/N(total), I calculated N(II)/N(I) using the Saha eqn (using electron density = 6.110^31 m^-3), and found N(II)/N(total) by noting that:
	N(total) = N(I) + N(II). Also, I used partition functions, Z(H(I))=2 and Z(H(II)) = 1 (no degeneracy for proton). Anyway, I calculated that N(II)/N(total) = 0.709, or 70.9%.
	This calculation neglected helium (all hydrogen in sun), but helium would lower hydrogen ionization energy by compressing H's orbitals (is this right? or would it raise the I.E.?) from 13.6 eV, which (I think) would, if lowered, increase the calculated fraction. Conversely, He is also ionized (III or II) producing more `free` electrons to reduce the fraction of ionized Hydrogen.
	Are there other effects to account for the 100% ionization. <small><span class="autosigned">—Preceding ] comment added by ] (] • ]) 01:20, 15 October 2008 (UTC)</span></small><!-- Template:Unsigned --> <!--Autosigned by SineBot-->
	- Why hasn't anyone tried to answer my question yet? It's been months... <span style="font-size: smaller;" class="autosigned">—Preceding ] comment added by ] (]) 07:22, 3 January 2009 (UTC)</span><!-- Template:UnsignedIP --> <!--Autosigned by SineBot-->

	I'd recommend you to check out the standard undergrad astrophysics text: Carole and Ostlie's ''Modern Astrophysics''. I'm sure I've found an answer in there but can't seem to find it today. Good luck! <span style="font-size: smaller;" class="autosigned">—Preceding ] comment added by ] (]) 21:38, 25 January 2009 (UTC)</span><!-- Template:UnsignedIP --> <!--Autosigned by SineBot-->

	== Faint young Sun vs. life cycle ==

	Neither the faint young sun subsection nor the ] article addresses the fact that the Sun was probably significantly more massive at the time (due to the blowoff by the solar wind in the intervening period, as mentioned elsewhere in the article -- though in connection with the future). This would result in an earth orbit closer to the Sun, thus offsetting the lower intrinsic solar brightness. The radius of the orbit is roughly inversely proportional to the Sun's mass, while the solar flux intercepted at earth's orbit is inversely proportional to the square of the orbit radius. So, if the solar mass was roughly 20% bigger than today, that would have completely compensated for the lower, 70% luminosity. Even if the mass difference was smaller -- understanding that the solar wind was probably less intense than today or in the future due to the lower luminosity, it seems this effect could still have been a significant contributor to the liquid water, in addition to possible greenhouse gases mentioned elsewhere. Are there any references as to how much mass has been blown off from the Sun since it was formed or containing a discussion of this effect?] (]) 21:47, 31 October 2008 (UTC)john wilkinson

	:In a billion years, the current solar wind will remove 0.003% of the solar mass. Later the sun will start to shed mass much more rapidly, but in the current phase of its evolution, the mass change is negligible. ] (]) 01:10, 1 November 2008 (UTC)

	=="Ending all human life"==
	"The increase in solar temperatures is such that in about a billion years, the surface of the Earth will become too hot for liquid water to exist, ending all terrestrial life."

	Really? You presume to say that you know what evolution will produce in a billion years? That not only natural selection will not produce organisms able to live in progressively hotter temperatures, even as the ''slow'' transition of the surface temperature crosses the boiling point, but that the descendants of humans and any other intelligent species will not devise a way to live in such a world? ] \| ] 07:05, 17 November 2008 (UTC)

	:Well to be fair this is the current standard scientific position. Once liquid water is no longer present on the planet complex life will probably not survive. There may still be microbial life left though. Exactly when this will occur is not known, that it will occur though is not in doubt. This is still an area in which more work needs to be done but science fiction aside most if not all complex life on earth will be gone at some point as the temperatures rise. ] (]) 21:15, 6 May 2009 (UTC)

	=="0.3 watt per m3"==
	The calculation is not consistent. The actual valvue should be higher, do the math!

	Regards,
	Bart Bozon <span style="font-size: smaller;" class="autosigned">—Preceding ] comment added by ] (]) 17:47, 26 November 2008 (UTC)</span><!-- Template:UnsignedIP --> <!--Autosigned by SineBot-->


	I second this. I did the calculation with the numbers given for core radius and solar output and got 35w/m3.
	Grady
	] (]) 08:01, 14 May 2009 (UTC) The entire discussion of the sun, beginning with einstein theory, which was first postulated by lorentz, which he discarded because it was incorrect, was the right thing to do. The sun , like all the other physical bodies, has resonant frequencies, which vibrates as it passes around the galaxy at about 200 meters per second, its resonant frequencies are that of the varying light energies we receive as these vibrations pass through the media that exists between the sun and the two planet system, the moon and the earth. In the days before the particle theory of light which has been taught for a hundred years is BS, The substance filling the space was once refered to as aether, a complex mixture of materials through which all vibrations in the electromagnetic spectrum are made up of. This substance is everywhere, thus ( The wave theory of light ) new discoveries from the colliders of more than 100 new materials in existence, occupying all space in the solar system, completely destroy the particle theory of light,the physical bodies in our solar system compose around 1.4 % of the solar systems mass. The sun is left without true description because we have yet ti develop materials that will not perish in its atmosphere, nor will we try if we believe the einstianian garble that dominate the pseudo-scientific/ quasi-medical/ legalinsurancefraud/academic caste system that is nothing but academic venture in the business to make money. They say anything. When you descend to the point of teaching theory as fact, then you have lost sight of true education, and are no longer fit for the use intended. The internet can teach a kid in a week what he can learn in a symester, without turning him into a drunk, junkie, or hooking him up with a sexual predatory for a professor. Academia is dead, its time to bury it and start over with learning and data mining techniques. La regime de la pedagogque is over. The information revolution will change the world. all the land is holy land and all the children are equal " goyim " is not a word, stop treating us like one---to the directors of wikipedia

	== Needs sources ==

	For an FA quality rating, this article seems to have a lot of material that is not sourced. Would it be possible for references to be added, as appropriate, so as to avoid a future ]? Thank you.—] (]) 20:54, 28 November 2008 (UTC)

	== Evidence for fusion ==

	Question for the experts:

	What (if any) actual experimental evidence do we have to support the idea that the core of the sun contains hydrogen, and that the primary source of energy is fusion? There's no cite, and no explanation -- and I haven't been able to find anything elsewhere. ] (]) 06:06, 6 December 2008 (UTC)

	:Question #2: It is mentioned that the photon travel time is something like 10,000 years to 170,000 years from the core to the surface. It is said that a photon is absorbed and re-emitted multiple times before it reaches the surface. What is the evidence that the 'same photon' is being absorbed and re-emitted? Slight explanation will benefit us. ] (]) 08:07, 17 December 2008 (UTC)

	== Mass of Sun ==

	What is the exact mass of the sun in KG?
	I guessed something like 1456136933221566562465252,7179234 KG... <span style="font-size: smaller;" class="autosigned">—Preceding ] comment added by ] (]) 16:05, 5 January 2009 (UTC)</span><!-- Template:UnsignedIP --> <!--Autosigned by SineBot-->
	:Well if you read the article and look at the source of the value given for the mass of the sun it takes you to: http://nssdc.gsfc.nasa.gov/planetary/factsheet/sunfact.html which says 1,989,100 x 10<sup>24</sup> kg. Which should be good enough value for any calculation you are doing unless you want a lot of precision, and even if you want that, if you think about it the sun is loosing mass all the time by converting it to energy in huge amounts and blowing it off in solar wind, so the mass is constantly decreasing.] (]) 12:33, 7 January 2009 (UTC) is theory using theory for the assumptions of the model this data proposes to be correct. Any data written about the sun, other than the frequencies and amplitudes of the energy waves passing through the media between the sun and earth, is little more than speculation. why print it ? to waste the valuable time of the goyim child ?

	== Speed of the Sun Around the Galaxy ==

	{{tl\|editsemiprotected}}
	According to "Milky Way a Swifter Spinner, More Massive, New Measurements Show" (http://www.cfa.harvard.edu/press/2009/pr200903.html) by the Harvard-Smithonian Center for Astrophysics on January 05, 2009, the new distances and speeds are as follows:
	- 28,000 light-years from the Milky Way’s center
	- 600,000 miles per hour (My manual conversion: 268 km/s)

	] (]) 23:27, 7 January 2009 (UTC)
	:{{ESp\|q}} The current distance is given to 3] with standard error. Can you find the accurate data which the article references? <font color="#FF0000">]</font> <font size="1">(])</font> 14:11, 8 January 2009 (UTC)
	::{{ESp\|n}} No response to query.--] ] ] a '''''<font color="green">]</font>''''', but not a shaker 21:24, 19 January 2009 (UTC)


	I have contacted the article authors, and received a response from Mark Reid. In short, he says, "A paper documenting the results in the press release is being drafted and hopefully will be submitted within about 1 month. Following refereeing, which usually takes 4-6 weeks, it should appear on the Astro-ph preprint server."

	He did go on to supply some of the detail (where "Ro is the distance to the Galactic Center and To is the circular rotation speed of the Galaxy at the location of the Sun."):

	<blockquote>
	We are using the NRAO Very Long Baseline Array (VLBA) and the Japanese VERA project to measure trigonometric parallaxes and proper motions of masers found in high-mass star-forming regions across the Milky Way.
	Early results from 18 sources locate several spiral arms. The Perseus spiral arm has a pitch angle of $16\deg\pm3\deg$, which favors four rather than two spiral arms for the Galaxy. Combining distances, proper motions, and radial velocities yields complete 3-dimensional kinematic information. We find that star forming regions on average are orbiting the Galaxy $\approx15$~\kms\ slower than expected for circular orbits.
	By fitting the measurements to a model of the Galaxy, we estimate the distance to the Galactic center $\Ro=8.4\pm0.6$~kpc and a circular rotation speed $\To=254\pm16$~\kms. The ratio $\To/\Ro$ can be determined to higher accuracy than either parameter individually, and we find it to be $30.3\pm0.9$~\kmsperkpc, in good agreement with the angular rotation rate determined from the proper motion of \SgrA. The data favor a rotation curve for the Galaxy that is nearly flat or slightly rising with Galactocentric distance. Kinematic distances are generally too large, sometimes by factors greater than two; they can be brought into better agreement with the trigonometric parallaxes by increasing $\To/Ro$ from the IAU recommended value of $25.9$~\kmsperkpc\ to a value near $30$~\kmsperkpc. We offer a "revised" prescription for calculating kinematic distances and their uncertainties, as well as a new approach for defining Galactic coordinates. Finally, our estimate of \To\ and of $\To/\Ro$, when coupled with direct estimates of \Ro, provide evidence that the Milky Way's dark matter halo is as massive as that of the Andromeda galaxy.
	</blockquote>

	In the statement above, only symbols have been altered from two single quotes (which interfered with Wiki code) to a double quote.

	If this is not adequate at this time, it will be necessary to wait for the formal publication.

	Thanks!</br>
	] (]) 18:39, 27 January 2009 (UTC)

	== Sun-Overview ==
	{{tlx\|editsemiprotected}}

	"The solar constant is equal to approximately 1368 watts per square meter at a distance of one AU from the Sun (that is, on or near Earth). Sunlight on the surface of Earth is attenuated by the Earth's atmosphere so that less power arrives at the surface—closer to 1,000 watts per directly exposed square meter in clear conditions when the Sun is near the zenith."
	This doesn't seem to be correct. At least one of these numbers must be incorrect for the amount of watts per exposed square meter.

	"Space based solar energy has long interested NASA and others in the space community because solar energy is eight times stronger in space then it is after it has passed through the atmosphere."
	Source: http://blog.wired.com/wiredscience/engineering/index.html
	<br/>{{unsigned2\| 09:20, 15 January 2009 \|Funkyfu}}

	:The article is correct. One factor is that in space you almost never get "behind the planet", so you enjoy sunshine 24 hours a day, not just an average of 3 or 4 hours. Putting solar panels in space is not only stupid, but ridiculous, though. What would happen if someone hacked into the beam controls and wiped out Detroit? That is why space based systems have never been developed. They are not needed, and are horribly problematic. The movies Dr. No and Diamonds are Forever use these death ray themes. ] (]) 20:45, 18 January 2009 (UTC)

	:: James Bond movies aren't a reliable guide to technology. ''What would happen if someone hacked into the beam controls'' is pretty much nothing, beyond the loss of power. The power density of the microwave beam wouldn't be that much brighter than sunlight.


	:: Space-based solar power hasn't been developed yet because thus far it's even more expensive than ground-based solar.
	::] (]) 01:40, 19 January 2009 (UTC) the variables of Optical resolution, space distance and time preclude the ability to postulate an accurate math construct of the model proposed here

	== Link to Nemesis article? ==

	I was surprised to find no mention of the Sun's hypothetical companion ], or any links to its article. I know that its existence is debatable, but as a still unsolved question that relates directly to the sun, I'm surprised to not see it. Should a link be added somewhere, possibly in the 'see also' section? ] (]) 21:12, 19 January 2009 (UTC)

	: not bad idea at all <small><span class="autosigned">—Preceding ] comment added by ] (] • ]) 05:20, 1 February 2009 (UTC)</span></small><!-- Template:Unsigned --> <!--Autosigned by SineBot-->

	== Additional citations needed? ==

	I just reverted an IP that messed up the intro sentence and now notice that there's a "more references needed" tag on the top of this article. So I scroll down and notice that several paragraphs are totally uncited. Does that mean this article is falling away from FA status? I'd recommend adding some before someone will bring up a review. --] (]) 02:07, 22 January 2009 (UTC)

	== Power density in the core ==

	In the section ] a power density of 6 µW/kg is given for the sun and it is compared to a rate of 1.2 W/kg given for the human body. By simple math this is a factor of 200 000 and not "a million times greater" as written in the text. What is the truth? ] (]) 11:46, 26 January 2009 (UTC)

	== Because of the protection, I can't edit the template, there is an error with the volume. ==

	I am calculating how to find the gravitational pull of objects and the math doesn't work out with what is listed, and if you follow the source cited for the volume, it is wrong anyway. It should read 1.41210^18 KM^3, or 1.41210^21 M^3 to keep it in line with the rest of the box. Because of the protection, I can't edit the article.

	Proof: As per the page here on the Earth's gravity, you can get the radius, in meters, of the object by taking the volume in KM^3, multiply that by 238,732,415 and take that to the power of 1/3

	Using the 1.41210^27 as the volume cited in meters, you get (1.41210^27 * 238,732,415)^(1/3) = approx 695,956,394,235.4 meters

	695,956,394,235 vs the 695,500,000 as quoted in the article is WAY off.

	The gravitational pull of the Sun should be about 274.1 meters per second per second. If you take that "radius" I calculated above and plug it into the formula of (mass in kg * G) / radius in meters squared where G = 6.67427x10^-11 you get about 0.000274 meters per second. That would be less than the moon.

	If you use 1.412*10^18 KM^3 in the formula to get the radius, you get about 695,956,394.2. That is closer to the 695,500,000 quoted as the radius.

	Plug that back into the formula for gravitational pull and you get about 274.09 meters per second per second. That is much closer to the 274.1 that is quoted in the Earth's Gravity article.

	Therefore, could someone with the proper editing level please change the volume to 1.412*10^21 M^3 please?] (]) 20:02, 1 February 2009 (UTC)

	== Sun volume ==
	{{tlx\|editsemiprotected\|]}}
	The volume here is indicated as 1.412×10^21 m³, and in the reference at nasa it is listed as 1.412×10^18 km³. You cant go from km^3 to m^3 by just multiplying 10^3, this is qubic km and qubic m, you have to multiply 10^9. The correct volume of the sun is 1.412×10^27 m³
	:{{ESp\|q}} Could you please put on here the exact page from NASA which you got that? Thanks. ] <sup>(])</sup> 12:58, 9 February 2009 (UTC)

	The nasa page is the fourth reference in the article (wich is linked from the volume data). The adress is: http://solarsystem.nasa.gov/planets/profile.cfm?Object=Sun&Display=Facts&System=Metric

	{{fixed}} ] as it was clearly off by a factor of a million, thank you for the heads-up. It seems that error was unfixed since 1 February. I also added the same NASA cite for the mass figure. ] (]) 00:18, 10 February 2009 (UTC)

	{{ESp\|note}} The infobox's Rotation velocity had a {{tl\|Fact}} "citation needed". I made a small fix and added the above NASA cite as support, but used because the NASA page is returning access errors at the moment. ] (]) 00:52, 10 February 2009 (UTC)


	==Turning causes burning==

	Hi,

	I find it strange that there is no information on this topic that the burning of the sun is caused by it's extreme high rotation speed, like the center of the earth.

	best,

	] (]) 21:15, 4 March 2009 (UTC)

	:I'm no expert on stars, but I don't see how the rotation speed would make the fusion reactor go (I'm assuming that this is what you meant by "burning". The sun is a gravitationally-contained fusion reactor, with the high pressures at the center allowing fusion. The energy released from the fusion pushes outwards on the sun, such that it doesn't gravitationally collapse because the outward forces from fusion (and some rotation, though I think that's a much smaller term) equal the inward forces from gravity.
	:I'm not sure what you're saying about the center of the Earth: it rotates very slightly faster than the rest of the planet, and no fusion reactions are occurring down there.
	:] (]) 16:33, 22 March 2009 (UTC)

	::Rotation causes gravity and if you spin something very hard it's starts to burn. If our solar system is turning, the center of it turns the fasted while the loose objects (planets) are turning along with the sun and are slowing down. And when you look at what speed the planets turn around the sun, while they are losing speed, the rotation of the sun must be immense. On the 'Nuclear fusion' page it says; "Nuclear fusion occurs naturally in stars" can't it be that the friction of heavy rotation causes these fusion reactions. In the same sense the earth is still a drop of hot lava spinning around with at the center a small core that rotates (vibrates) at very high speed while the earth's crust is cooled down and turns much slower.

	::This idea seemed logical to me so I thought I would find a reflection of it on the sun's wiki page, but I'm not an expert and this idea is probably a bit to simplistic.
	::] (]) 11:15, 24 March 2009 (UTC)

	::::Nope, no-can-do. Rotation does not cause gravity, and spinning doesn't cause burning (unless there is enough friction) - in any case, we're talking about nuclear fusion instead of fire. The planets aren't slowing down much at all (for practical purposes, they aren't), and their velocities are based on conservation of angular momentum. Fusion is caused by the high pressure at the center of the sun. Your statements about the Earth's interior (on which I know more) aren't correct either; try reading Misplaced Pages articles on the topic. If you like, I could suggest a couple of textbooks. ] (]) 10:26, 24 March 2009 (UTC)

	:::::Ok thx for the information, you may remove my comment/topic from this 'talk' page if you wish.
	:::::kind regards, michel
	:::::] (]) 14:08, 25 March 2009 (UTC)

	:::::: No problem. In case you read these ideas somewhere, I'll leave the discussion up, in case anyone else has similar questions. ] (]) 17:22, 25 March 2009 (UTC)

	==Distance from Milky Way Core==
	...is reported to be both 26K ly and 24.8K ly in the article. <small><span class="autosigned">—Preceding ] comment added by ] (] • ]) 17:37, 10 March 2009 (UTC)</span></small><!-- Template:Unsigned --> <!--Autosigned by SineBot-->
	:Looks like someone fixed it: I now see 2 instances of "26" (infobox and body) and one "24-26" (lede). They should still probably agree with one another, or at least not give the approximate distance at the top of the range of distances, though maybe that's what the source had; I don't know this offhand, but I will add the info if I get to digging. ] (]) 16:38, 22 March 2009 (UTC)
	::The sources used in the article say:
	::*NewScientist (2008) (This is a digest of an article in Mon. Not. R. Astron. Soc.A): Old figure 26,100 LY; new figure 27,400 LY
	::*AnnRev (1993): 26,100 LY
	::*Astrophysical Journal (2003): 25,900 LY
	::*Astron. Nachr. (2004): 25,900 LY
	::*Astrophysical Journal (2005): 25,850 LY
	::From what it looks like, consistent recent results place it at about 25,900 LY, and that number should be used, unless we see some good reason to jump up by 1500 and use the 2008 paper, linked . ] (]) 17:08, 22 March 2009 (UTC)

	== Solar system age ==

	The age in the first paragraph of "Life Cycle" seems to be a well-intentioned but incorrect synthesis. The 4.567 Ga "Age of the Earth" given in the note is actually the age of solar system from radiometric dating of the earliest known solar system material: see the article on ]s, which the note mentions. I propose that the note be deleted, and the age be given as 4.567 Ga, with a reference to the paper that gives this date. I've got the ref right in front of me, so I'll do it, I just want someone else's approval to say that I'm not wrong in changing this. ] (]) 17:19, 22 March 2009 (UTC)
	:OK - no objections. Gone, baby. Tell me what you think (especially if you don't like it); I'm not sure if I like the way I said it. ] (]) 08:18, 28 March 2009 (UTC)

	== Cultural history language correction ==

	The article romanizes the character 日 as ''nichi'' in Japanese, but in modern Japanese ''nichi'' almost always refers to days or dates (there are only a few exceptions to this, such as 日本 - ''nippon'' for "the land of the rising sun" - or 日曜日 - ''nichiyōbi'' for literally "sunday"). A Japanese person referring to the Sun would read the character as ''hi'' instead. --] (]) 00:26, 23 April 2009 (UTC)

	Yes, 日 should be "hi". ] (]) 03:45, 26 April 2009 (UTC)

	==Great Eastern Sun==

	* This is the socalled Great Eastern Sun.
	Am I allowed to put it here? Or does the text mean that it is forbidden?
	:-- ] (]) 10:54, 3 April 2009 (UTC)

	::Don't see how it would help much here - if we include this, why not every sun-symbol? ] (]) 03:45, 26 April 2009 (UTC)

	== Should the title be "Sun" or "Earth's Sun" ==

	: see also: ]

	Should the title be "Sun" or "Earth's Sun". I prefer Earth's Sun to make it clearer that we are not talking about stars in general. You could argue that "Sun" is clear enough, but why not make it clearer, you could argue that "Earth's Sun" looks weird, but so what.--] (]) 02:55, 26 April 2009 (UTC)

	:Anyone with an opinion of argument about this, please post it.--] (]) 14:38, 26 April 2009 (UTC)

	:"Sun", as that is the proper name in English. "Earth's Sun" would incorrectly imply that other stars could also be called "suns", when they cannot. (There is only one "Sun", that being the star at the centre of the Solar System.) --''']'''''<small><sup>]</sup><sub>]</sub></small>''

	::My original wording of my first comment in this section, "I prefer Earth's Sun to make it clearer with sun we are talking about." was poor, I have updated it to say what I meant to say,"I prefer Earth's Sun to make it clearer that we are not talking about stars in general." sorry for the PARTIAL misunderstanding, it was my fault.--] (]) 03:24, 26 April 2009 (UTC)
	:::Same reply, though. "Earth's Sun" would still make an incorrect implication. --''']'''''<small><sup>]</sup><sub>]</sub></small>'' 03:37, 26 April 2009 (UTC)

	::::Agree with Ckatz: ours is Sun, all others are stars. ] (]) 03:40, 26 April 2009 (UTC)

	:::: ], so the implication is correct--] (]) 12:03, 26 April 2009 (UTC)

	:::::Hmm - so maybe it's one of those capital letter things again: Sun/sun. ] (]) 16:42, 26 April 2009 (UTC)

	::::::Awickert, you are correct ], the title should be changed to "Earth's sun", not "Earth's Sun"--] (]) 17:16, 26 April 2009 (UTC)

	:::::::They do have that definition on the disambiguation page. General Misplaced Pages policy is to give the least-qualified name to the primary usage of the word. The alternative seems to be changing it to "The sun" or "Earth's sun", and making "Sun" a disambiguation page. As for browsability, I don't see the advantage in that. We could refactor the disambig page to put the star from another solar system at top. ] (]) 17:53, 26 April 2009 (UTC)

			Under the subtitle "Motion in the Solar System"

			There is an unsupported conclusion with an orphan reference. To wit:
	::::::::Why would "Sun" have to become a disambiguation page?--] (]) 18:07, 26 April 2009 (UTC)
			" The orbits of the inner planets, including of the Earth, are similarly displaced by the same gravitational forces, so the movement of the Sun has little effect on the relative positions of the Earth and the Sun or on solar irradiance on the Earth as a function of time. "

			'''Checking footnote 140 reveals:'''
	:::::::::See comments on ]. ] (]) 18:11, 26 April 2009 (UTC)

			Retraction of: Scientific Reports 10.1038/s41598-019-45584-3, published online 24 June 2019
	:::::Almost all common words in English have more than one meaning. This is why Misplaced Pages has adopted a principle of "least surprise" in the naming of articles. If someone finds an article named ], 99% of them would expect the article to be about the star that Earth orbits. Most people would be surprised if the article were about anything else. Likewise ] is an article about stellar ojects, not about actors and actresses. The article on ] is about the planet, not about soil. When a noun has a widely known usage with a proper noun sense, that meaning is the one most likely to be expected by a reader. If Misplaced Pages were to abandon the principle of least surprise, nearly every article with a common noun name would have to be renamed. Consider that a ] can be a manufacturing facility; ] can be a diacritical character in writing; ] can mean a section of a larger literary work; and ] can mean the head of an organization or group. The article titles do not have to be 100% precise, but merely 100% descriptive. --] (]) 21:53, 26 April 2009 (UTC)
			The Editors have retracted this Article. After publication, concerns were raised regarding the interpretation of how the Earth-Sun distance changes over time and that some of the assumptions on which analyses presented in the Article are based are incorrect.The analyses presented in the section entitled “Effects of SIM on a temperature in the terrestrial hemispheres” are based on the assumption that the orbits of the Earth and the Sun about the Solar System barycenter are uncorrelated, so that the Earth-Sun distance changes by an amount comparable to the Sun-barycenter distance. '''Post-publication peer review has shown that this assumption is inaccurate''' because the motions of the Earth and the Sun are primarily due to Jupiter and the other giant planets, which accelerate the Earth and the Sun in nearly the same direction, and thereby generate highly-correlated motions in the Earth and Sun. Current ephemeris calculations show that the Earth-Sun distance varies over a timescale of a few centuries by substantially less than the amount reported in this article. As a result the Editors no longer have confidence in the conclusions presented. S. I. Zharkov agrees with the retraction. V. V. Zharkova, E. Popova, and S. J. Shepherd disagree with the retraction.

			Folkner, W. M., Williams, J. G., Boggs, D. H., Park, R.S. & Kuchynka, P. The Planetary and Lunar Ephemerides DE430 and DE431. "The Interplanetary Network Progress Report", Volume 42–196, February 15, 2014.
	::::::The Sun is the dominant body in the solar system, so doesn't really belong to the Earth, so Earth's Sun would be a bit wrong, and calling it Jupiter's Sun would be equally valid. However renaming Earth to "The Sun's Earth" would be more correct that what the OP suggests. ] (]) 22:11, 26 April 2009 (UTC)

			JPL Horizons on-line solar system data.
	:::::::About the Sun not really belonging to Earth, does your home not really belong to you because it is much more massive then you, would it be as valid to call it your T.V.'s home as it would to call it your home.--] (]) 22:55, 26 April 2009 (UTC)


			Reference:
	== Relative volume of the Suns core. ==


			== faint young Sun paradox ==
	If the radius of the core is 0,2 solar radii, its volume is 0,2^3 or 1/125 solar volumes, so much less than the 0,1 given in the article.
	Willem Schot
	<small><span class="autosigned">—Preceding ] comment added by ] (] • ]) 12:49, 3 May 2009 (UTC)</span></small><!-- Template:Unsigned --> <!--Autosigned by SineBot-->

	:~~Agreed~~ - it ~~would~~ ~~have~~ to be ~~approx.~~ ~~0.46~~ ~~solar~~ ~~radii~~ ~~for~~ this to be ~~true.~~ ~~I'll~~ ~~base~~ ~~this~~ on the ~~cited~~ ~~source~~ ~~(volume),~~ and ~~change~~ ~~the radius~~ ~~reported~~ in ~~the~~ article ~~accordingly~~. ] (]) 22:52, 9 ~~May~~ ~~2009~~ (UTC)		@] removed the summary of ], but in my opinion this topic is a great application of our understand (or lack) of the Sun's life history and should be included in this article. ] (]) 15:52, 11 October 2024 (UTC)
			:I do see the point that it is related to the Sun's life history. OTOH, the predominant theory according to ] has a lot more to do with the Earth (greenhouse effect) than it does with the Sun, so maybe it's not actually that revealing a data point regarding the Sun's evolution. ] (]) 16:30, 11 October 2024 (UTC)
	::Well, it seems that the interwebs, disagree, so I am pinning radius at 0.2 based on Science article, and changing things accordingly. ] (]) 23:09, 9 May 2009 (UTC)
			::Ok thanks, I think that is what Praemonitus was getting at. ] (]) 16:40, 11 October 2024 (UTC)
			::: Yes, the point about the increases to the Sun's luminosity and radius are already covered in the "Main sequence" section, so I didn't see a need to repeat that. There is a chart on the ] article that provides useful information on the topic. ] (]) 19:10, 11 October 2024 (UTC)

			== Question about the chemical abundances of the Sun ==
	== Alternative solar models ==

			<s>The Composition section says the following:
	Having done some reading on the subject, I've come to realize there are a significant amount of alternative solar models, some of which are backed up with fairly presentable observations. I was therefore surprised when I typed "]" into Misplaced Pages that could find no reference on that page linking to existing alternative models.
			* At this time in the Sun's life, they account for 74.9% and 23.8%, respectively, of the mass of the Sun in the photosphere.
			* Originally it would have been about 71.1% hydrogen, 27.4% helium, and 1.5% heavier elements.
			I'm puzzled about why the Sun would lose helium mass at the photosphere. Was it a diffusion process? (Cf. ].) The article needs to explain it.</s> ] (]) 15:08, 14 October 2024 (UTC)

			:Not a loss of helium but a gain of heavier elements. See Introduction:
	Such a reference would be entirely appropriate considering the difficulties listed with the present accepted model.
			:* Lodders, K. (2021). Relative atomic solar system abundances, mass fractions, and atomic masses of the elements and their isotopes, composition of the solar photosphere, and compositions of the major chondritic meteorite groups. Space Science Reviews, 217(3), 44.
			:] (]) 16:36, 14 October 2024 (UTC)
			:: The H + He account for 98.5% at the start and 98.7% at present. Hence, the heavier elements have decreased in mass. Hmm. ] (]) 18:17, 14 October 2024 (UTC)
			::: Okay, it's covered by the next paragraph: heavy element settling from the photosphere. ] (]) 20:33, 15 October 2024 (UTC)

			== Norman or Joseph? ==
	For example, after reading references throughout the web referring to an electric solar model, I was surprised to find that Misplaced Pages had a dearth of information on the subject.

			The article refers to "Norman" Lockyer and later to "Joseph" Lockyer even though the same person is indicated.
	However strongly opposed many mainstream scientists are to these non conventional approaches, it is nonetheless disturbing that no reference is made to such alternatives in Misplaced Pages.

			Some consistent name should be chosen and used consistently. ] (]) 19:37, 25 October 2024 (UTC)
	Might I be missing something? Could someone with better research skills direct me to alternative solar models in Misplaced Pages? <small><span class="autosigned">—Preceding ] comment added by ] (] • ]) 16:49, 5 May 2009 (UTC)</span></small><!-- Template:Unsigned --> <!--Autosigned by SineBot-->

			:I did not find any mention of "Joseph Lockyer". The person named "Joseph Norman Lockyer" went exclusively by "Norman Lockyer". See ]. ] (]) 00:18, 26 October 2024 (UTC)
	:Please keep your fights on the baut forum. Misplaced Pages is not the place for them.] 22:48, 5 May 2009 (UTC)
			::I simplified the mention of 'Joseph Lockyer' earlier to just 'Lockyer' since Norman Lockyer was mentioned just a couple sentences above. ] (]) 00:21, 26 October 2024 (UTC)
			:::Ok great, I saw that. So fixed! {{done}} ] (]) 00:25, 26 October 2024 (UTC)

			== Nearly perfect sphere? ==
	I'm sorry, although we both seem to be communicating in English, your brief comment appears directed somewhere else entirely.
	Again, question: Why is there no mention of alternative solar models on the Sun reference? Do these not exist?
	--] (]) 05:39, 6 May 2009 (UTC)

			Is a tennis ball "a near perfect sphere"? A Class A ball bearing has an oblateness of under 3 ppm. The Sun's oblateness is nearly 3 times worse than that. And that's assuming the only thing we're concerned about is its GROSS physical dimensions (i.e. the major and minor axes). This is real life, not a 3D geometry exercise. Characterizing is as "near perfect" is totally vacuous. It serves no purpose and is wrong by many measures. Turns out, who knew?, that texture matters. The Photosphere can vary by 100's of km (according to the article) Do the math: 100 ÷ 7000 = 0.014 or 1.4% This isn't even reasonably near what could be made in the early 18th Century, let alone the 21st. That description should be removed. (And of course, anyone who claims that its surface is "near perfect" hasn't seen a Solar Prominence or a Coronal Mass Ejection. And never mind the fact that the heliopause not even close to spherical and varies by orders of magnitude more than the Sun's radius. (But the article does -sorta- qualify that it's talking about the visible surface of the Sun, i.e. the Photosphere, so it could be worse.)] (]) 09:09, 31 December 2024 (UTC)
	:I think that the reason is that your first comment came off on the aggressive side: phrases like ''it is nonetheless disturbing'' don't rub volunteer editors the right way. I'm no expert here, but my best guess is that these theories are not given much weight by scientists, and are therefore (per ] not mentioned here. A good way to proceed would be to lay out peer-reviewed scientific sources that give the alternate models. ] (]) 08:19, 6 May 2009 (UTC)

			:It matters because it is related to the Sun's internal rotation, which is discussed in the very next subsection. Perhaps that connection could be made more explicit. <span style="border-radius:2px;padding:3px;background:#1E816F">]<span style="color:#fff"> ‥ </span>]</span> 09:21, 31 December 2024 (UTC)
	As a layman I appreciate that there is an accepted scientific model, but sometimes 'alternative' theories become popularized and perhaps at least a reference to them as debatable (or refutable, if you prefer) seems necessary in an encyclopedic article. For example, a theory of a rigid iron structure of the sun might be alternative, but it is mentioned in passing in Plimer's ''Heaven and Earth: global warming, the missing science''. A lay reader like me relies on Misplaced Pages to give me at least some information to understand whether this is theory is part of the discussion or is marginal. thanks. --] (]) 23:11, 9 May 2009 (UTC)
			::I rewrote that paragraph, please review. I did not make the connection to rotation but the Gough ref could be used to do so. ] (]) 20:07, 31 December 2024 (UTC)

			== How does this work? ==
	::Hi Richardson. Sorry I haven't responded - the truth is that I don't really know about this stuff. If you could point me to a scientific paper referenced by the book, I'd be willing to try to track things down. ] (]) 04:43, 12 May 2009 (UTC)

			hello I am merely 11 so some off my info may be wrong. How does the sun connect to earth in a way that could hurt earth. The sun is a part of global warming and too my knowledge and love off planets the Sun should not be getting any closer. How does this work? ] (]) 16:07, 2 January 2025 (UTC)
	:Esteban, you've mentioned that there is a "significant amount of alternative solar models". It's important to keep in mind in order to merit inclusion within an article such this one, what is important is not the ''quantity'' of alternative theories, but the amount of support each model has received from the scientific community. Although I have not worked on this article, I would imagine that a section on alternate theories would probably end up being nothing more than a list or a hodge-podge paragraph with one sentence dedicated to each alternative model, which wouldn't really be beneficial to the article. If you've come across a few alternative models that you think should be mentioned, perhaps you should start an article such as ] or ] or some such? --'''] · ]''' 04:07, 12 May 2009 (UTC)

			:Well, the light from the sun is needed for life on Earth in the first place. The Sun is not generally getting closer to the earth (there's small change that repeats each year but it's not trending closer.) may be easier to understand. --] (]) 00:57, 3 January 2025 (UTC)
	== Verification ==
			::Thank you for this information Noreen! ] (]) 18:01, 3 January 2025 (UTC)
	The article seems to contain too many unverified claims. It is vital either to verify all of them or delete if unverifiable. Otherwise the article may go to ]. ''']'''<sup>]\]</sup> 09:38, 27 May 2009 (UTC)

Latest revision as of 18:01, 3 January 2025

Skip to table of contents

This is the talk page for discussing improvements to the Sun article.
This is not a forum for general discussion of the article's subject.

Put new text under old text. Click here to start a new topic.
New to Misplaced Pages? Welcome! Learn to edit; get help.

Article policies

Find sources: Google (books · news · scholar · free images · WP refs) · FENS · JSTOR · TWL

Archives: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10Auto-archiving period: 3 months

Sun is a featured article; it (or a previous version of it) has been identified as one of the best articles produced by the Misplaced Pages community. Even so, if you can update or improve it, please do so.

Sun is part of the Solar System series, a featured topic. This is identified as among the best series of articles produced by the Misplaced Pages community. If you can update or improve it, please do so.

This article appeared on Misplaced Pages's Main Page as Today's featured article on March 20, 2006.

Article milestones
Date	Process	Result
February 26, 2006	Featured article candidate	Promoted
October 15, 2006	Featured topic candidate	Promoted
July 30, 2009	Featured article review	Kept
June 13, 2021	Featured topic removal candidate	Demoted
June 20, 2022	Featured topic candidate	Promoted
November 2, 2024	Featured article review	Kept
Current status: Featured article

This

level-2 vital article is rated FA-class on Misplaced Pages's content assessment scale.
It is of interest to the following WikiProjects:

Physics Top‑importance

	Physics portal This article is within the scope of WikiProject Physics, a collaborative effort to improve the coverage of Physics on Misplaced Pages. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.PhysicsWikipedia:WikiProject PhysicsTemplate:WikiProject Physicsphysics
Top	This article has been rated as Top-importance on the project's importance scale.

Astronomy: Astronomical objects / Solar System Top‑importance

	Astronomy portal This article is within the scope of WikiProject Astronomy, which collaborates on articles related to Astronomy on Misplaced Pages.AstronomyWikipedia:WikiProject AstronomyTemplate:WikiProject AstronomyAstronomy
Top	This article has been rated as Top-importance on the project's importance scale.
	This article is supported by WikiProject Astronomical objects, which collaborates on articles related to astronomical objects.
	This article is supported by Solar System task force (assessed as Top-importance).

Weather: Space Low‑importance

This article is within the scope of WikiProject Weather, which collaborates on weather and related subjects on Misplaced Pages. To participate, help improve this article or visit the project page for details.

WeatherWikipedia:WikiProject WeatherTemplate:WikiProject WeatherWeather

Low

This article has been rated as Low-importance on the project's importance scale.

This article is supported by the Space weather task force (assessed as Low-importance).

Spoken Misplaced Pages

This article is within the scope of WikiProject Spoken Misplaced Pages, a collaborative effort to improve the coverage of articles that are spoken on Misplaced Pages. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.Spoken WikipediaWikipedia:WikiProject Spoken WikipediaTemplate:WikiProject Spoken WikipediaSpoken Misplaced Pages

Unsafe conclusion in Motion and location

Under the subtitle "Motion in the Solar System"

There is an unsupported conclusion with an orphan reference. To wit: " The orbits of the inner planets, including of the Earth, are similarly displaced by the same gravitational forces, so the movement of the Sun has little effect on the relative positions of the Earth and the Sun or on solar irradiance on the Earth as a function of time. "

Checking footnote 140 reveals:

Retraction of: Scientific Reports 10.1038/s41598-019-45584-3, published online 24 June 2019 The Editors have retracted this Article. After publication, concerns were raised regarding the interpretation of how the Earth-Sun distance changes over time and that some of the assumptions on which analyses presented in the Article are based are incorrect.The analyses presented in the section entitled “Effects of SIM on a temperature in the terrestrial hemispheres” are based on the assumption that the orbits of the Earth and the Sun about the Solar System barycenter are uncorrelated, so that the Earth-Sun distance changes by an amount comparable to the Sun-barycenter distance. Post-publication peer review has shown that this assumption is inaccurate because the motions of the Earth and the Sun are primarily due to Jupiter and the other giant planets, which accelerate the Earth and the Sun in nearly the same direction, and thereby generate highly-correlated motions in the Earth and Sun. Current ephemeris calculations show that the Earth-Sun distance varies over a timescale of a few centuries by substantially less than the amount reported in this article. As a result the Editors no longer have confidence in the conclusions presented. S. I. Zharkov agrees with the retraction. V. V. Zharkova, E. Popova, and S. J. Shepherd disagree with the retraction.

Folkner, W. M., Williams, J. G., Boggs, D. H., Park, R.S. & Kuchynka, P. The Planetary and Lunar Ephemerides DE430 and DE431. "The Interplanetary Network Progress Report", Volume 42–196, February 15, 2014.

JPL Horizons on-line solar system data. Horizons System

Reference: Retraction Note: Oscillations of the baseline of solar magnetic field and solar irradiance on a millennial timescale

faint young Sun paradox

@Praemonitus removed the summary of Faint young Sun paradox, but in my opinion this topic is a great application of our understand (or lack) of the Sun's life history and should be included in this article. Johnjbarton (talk) 15:52, 11 October 2024 (UTC)

I do see the point that it is related to the Sun's life history. OTOH, the predominant theory according to Faint young Sun paradox has a lot more to do with the Earth (greenhouse effect) than it does with the Sun, so maybe it's not actually that revealing a data point regarding the Sun's evolution. Double sharp (talk) 16:30, 11 October 2024 (UTC)

Ok thanks, I think that is what Praemonitus was getting at. Johnjbarton (talk) 16:40, 11 October 2024 (UTC)

Yes, the point about the increases to the Sun's luminosity and radius are already covered in the "Main sequence" section, so I didn't see a need to repeat that. There is a chart on the Solar luminosity article that provides useful information on the topic. Praemonitus (talk) 19:10, 11 October 2024 (UTC)

Question about the chemical abundances of the Sun

~~The Composition section says the following:~~

At this time in the Sun's life, they account for 74.9% and 23.8%, respectively, of the mass of the Sun in the photosphere.

Originally it would have been about 71.1% hydrogen, 27.4% helium, and 1.5% heavier elements.

~~I'm puzzled about why the Sun would lose helium mass at the photosphere. Was it a diffusion process? (Cf. chemically peculiar star.) The article needs to explain it.~~ Praemonitus (talk) 15:08, 14 October 2024 (UTC)

Not a loss of helium but a gain of heavier elements. See Introduction:

Lodders, K. (2021). Relative atomic solar system abundances, mass fractions, and atomic masses of the elements and their isotopes, composition of the solar photosphere, and compositions of the major chondritic meteorite groups. Space Science Reviews, 217(3), 44.

Johnjbarton (talk) 16:36, 14 October 2024 (UTC)

The H + He account for 98.5% at the start and 98.7% at present. Hence, the heavier elements have decreased in mass. Hmm. Praemonitus (talk) 18:17, 14 October 2024 (UTC)

Okay, it's covered by the next paragraph: heavy element settling from the photosphere. Praemonitus (talk) 20:33, 15 October 2024 (UTC)

Norman or Joseph?

The article refers to "Norman" Lockyer and later to "Joseph" Lockyer even though the same person is indicated.

Some consistent name should be chosen and used consistently. 71.128.242.202 (talk) 19:37, 25 October 2024 (UTC)

I did not find any mention of "Joseph Lockyer". The person named "Joseph Norman Lockyer" went exclusively by "Norman Lockyer". See Talk:Norman Lockyer. Johnjbarton (talk) 00:18, 26 October 2024 (UTC)

I simplified the mention of 'Joseph Lockyer' earlier to just 'Lockyer' since Norman Lockyer was mentioned just a couple sentences above. Sgubaldo (talk) 00:21, 26 October 2024 (UTC)

Ok great, I saw that. So fixed!

Done Johnjbarton (talk) 00:25, 26 October 2024 (UTC)

Nearly perfect sphere?

Is a tennis ball "a near perfect sphere"? A Class A ball bearing has an oblateness of under 3 ppm. The Sun's oblateness is nearly 3 times worse than that. And that's assuming the only thing we're concerned about is its GROSS physical dimensions (i.e. the major and minor axes). This is real life, not a 3D geometry exercise. Characterizing is as "near perfect" is totally vacuous. It serves no purpose and is wrong by many measures. Turns out, who knew?, that texture matters. The Photosphere can vary by 100's of km (according to the article) Do the math: 100 ÷ 7000 = 0.014 or 1.4% This isn't even reasonably near what could be made in the early 18th Century, let alone the 21st. That description should be removed. (And of course, anyone who claims that its surface is "near perfect" hasn't seen a Solar Prominence or a Coronal Mass Ejection. And never mind the fact that the heliopause not even close to spherical and varies by orders of magnitude more than the Sun's radius. (But the article does -sorta- qualify that it's talking about the visible surface of the Sun, i.e. the Photosphere, so it could be worse.)40.142.176.185 (talk) 09:09, 31 December 2024 (UTC)

It matters because it is related to the Sun's internal rotation, which is discussed in the very next subsection. Perhaps that connection could be made more explicit. Remsense ‥ 论 09:21, 31 December 2024 (UTC)

I rewrote that paragraph, please review. I did not make the connection to rotation but the Gough ref could be used to do so. Johnjbarton (talk) 20:07, 31 December 2024 (UTC)

How does this work?

hello I am merely 11 so some off my info may be wrong. How does the sun connect to earth in a way that could hurt earth. The sun is a part of global warming and too my knowledge and love off planets the Sun should not be getting any closer. How does this work? 50.127.5.36 (talk) 16:07, 2 January 2025 (UTC)

Well, the light from the sun is needed for life on Earth in the first place. The Sun is not generally getting closer to the earth (there's small change that repeats each year but it's not trending closer.) This page may be easier to understand. --Noren (talk) 00:57, 3 January 2025 (UTC)

Thank you for this information Noreen! 50.127.5.36 (talk) 18:01, 3 January 2025 (UTC)

Categories: