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One of the Cydonian mesas, situated at 40°75' north ] and 9°46' west ], took on the striking appearance of a ] Face on Mars in a photo taken by ] on ], ]. Some commentators, most notably ], believe it to be evidence of a long-lost ] along with other features they believe are present, such as apparent ]s, which they argue are part of a ]. ] of the early Viking images led a few researchers to suggest that the features of the Face might not be an accidental consequence of viewing conditions<ref name="carlotto88"/>. One of the Cydonian mesas, situated at 40°75' north ] and 9°46' west ], took on the striking appearance of a ] Face on Mars in a photo taken by ] on ], ]. Some commentators, most notably ], believe it to be evidence of a long-lost ] along with other features they believe are present, such as apparent ]s, which they argue are part of a ]. ] of the early Viking images led a few researchers to suggest that the features of the Face might not be an accidental consequence of viewing conditions<ref name="carlotto88"/>.


However, today it is generally accepted to be an ], an example of ]<ref>Britt, R.R., , ], ] ]. Retrieved ] ].</ref>. After analysis of the higher resolution ] data ] stated that "a detailed analysis of multiple images of this feature reveals a natural looking Martian hill whose illusory face-like appearance depends on the viewing angle and angle of ]"<ref>{{cite web | url=http://www.nasa.gov/multimedia/imagegallery/image_feature_60.html | title=The Face on Mars, Viking Project | publisher= ] website | accessdate=2007-04-26}}</ref>. Similar optical illusions can be found in the geology of ]; an example is the ], which resembles a human head wearing a ] ]<ref>{{cite web | url=http://maps.google.com/maps?z=16&ll=50.010083,-110.113006&spn=0.009363,0.020084&t=k&iwloc=addr | title=Badlands Guardian Geological Feature | publisher=] | accessdate=2007-04-26}}</ref>. However, today it is generally accepted by mainstream science to be an ], an example of ]. ] has always stated, without any research performed, that "a detailed analysis of multiple images of this feature reveals a natural looking Martian hill whose illusory face-like appearance depends on the viewing angle and angle of ]"<ref>{{cite web | url=http://www.nasa.gov/multimedia/imagegallery/image_feature_60.html | title=The Face on Mars, Viking Project | publisher= ] website | accessdate=2007-04-26}}</ref>.


Originally, eighteen images of the Cydonia Mensae region were taken by the ] and ] ]s, but only seven have resolutions better than 250 m/] (820 ft/pixel). The other eleven images have resolutions worse than 550 m/pixel (1800 ft/pixel) and are virtually useless for studying the feature. Of the seven good images, the lighting and time at which two pairs of images were taken are so close as to reduce the number to five usable, distinct images. The ''Mission to Mars: Viking Orbiter Images of Mars'' CD-ROM image numbers are: 35A72 (VO-1010), 70A13 (VO-1011), 561A25 (VO-1021), 673B56 & 673B54 (VO-1063), and 753A33 & 753A34 (VO-1028)<ref>, ] ]; raw data in ] can be downloaded from these links: , , , , Originally, eighteen images of the Cydonia Mensae region were taken by the ] and ] ]s, but only seven have resolutions better than 250 m/] (820 ft/pixel). The other eleven images have resolutions worse than 550 m/pixel (1800 ft/pixel) and are virtually useless for studying the feature. Of the seven good images, the lighting and time at which two pairs of images were taken are so close as to reduce the number to five usable, distinct images. The ''Mission to Mars: Viking Orbiter Images of Mars'' CD-ROM image numbers are: 35A72 (VO-1010), 70A13 (VO-1011), 561A25 (VO-1021), 673B56 & 673B54 (VO-1063), and 753A33 & 753A34 (VO-1028)<ref>, ] ]; raw data in ] can be downloaded from these links: , , , ,

Revision as of 12:32, 16 October 2007

The Cydonia Region taken by the Viking 1 orbiter and released by NASA/JPL on July 25, 1976 (north is to the upper right).

Cydonia Mensae is an albedo feature (region) on Mars. It lies in the planet's northern hemisphere in a transitional zone between the heavily-cratered regions to the South, and relatively smooth plains to the North. Some planetologists believe that the northern plains may once have been ocean beds and that Cydonia may have been a coastal zone (though this is still uncertain). Cydonia is covered in numerous mesas, some of which have attracted both scientific and popular attention.

The Face on Mars

Cropped version of the original batch-processed photo (#35A72) of the 'Face on Mars'. The black dots that give the image a speckled appearance (including the one that seems like a 'nostril') are data errors.
The second 1976 Viking image (left, image #70A13) compared with the 2001 Mars Global Surveyor image (right). 20 meters per pixel resolution.
Mars Global Surveyor high-resolution photo of the "Face on Mars" (North is to the upper left)

One of the Cydonian mesas, situated at 40°75' north latitude and 9°46' west longitude, took on the striking appearance of a humanoid Face on Mars in a photo taken by Viking 1 on July 25, 1976. Some commentators, most notably Richard C. Hoagland, believe it to be evidence of a long-lost Martian civilization along with other features they believe are present, such as apparent pyramids, which they argue are part of a ruined city. Image analysis of the early Viking images led a few researchers to suggest that the features of the Face might not be an accidental consequence of viewing conditions.

However, today it is generally accepted by mainstream science to be an optical illusion, an example of pareidolia. NASA has always stated, without any research performed, that "a detailed analysis of multiple images of this feature reveals a natural looking Martian hill whose illusory face-like appearance depends on the viewing angle and angle of illumination".

Originally, eighteen images of the Cydonia Mensae region were taken by the Viking 1 and 2 orbiters, but only seven have resolutions better than 250 m/pixel (820 ft/pixel). The other eleven images have resolutions worse than 550 m/pixel (1800 ft/pixel) and are virtually useless for studying the feature. Of the seven good images, the lighting and time at which two pairs of images were taken are so close as to reduce the number to five usable, distinct images. The Mission to Mars: Viking Orbiter Images of Mars CD-ROM image numbers are: 35A72 (VO-1010), 70A13 (VO-1011), 561A25 (VO-1021), 673B56 & 673B54 (VO-1063), and 753A33 & 753A34 (VO-1028).

Since September 2006, a succession of new data from the Cydonia region have been published by the European Space Agency and the HiRISE team. These have included photographs taken by the Mars Express probe and the Mars Reconnaissance Orbiter, and a 3D animation of the "Face on Mars" using a combination of digital data from the High Resolution Stereo Camera (HRSC) on the Mars Express probe and the Mars Orbiter Camera (MOC) on board NASA's Mars Global Surveyor. In contrast to the relatively low resolution of the Viking images of Cydonia, these new platforms afford much improved resolution. For instance, the Mars Express images are at a resolution of 14 m/pixel (46 ft/pixel) or better.

Cydonia and the Face on Mars appear frequently in popular culture, including feature films, television series, videogames and even music. Astronomer Carl Sagan criticized many conclusions people have made about it in his book The Demon Haunted World.

See also

References

  1. Head, J.W., Kreslavsky, M., Hiesinger, H., Ivanov, M., Pratt, S., Seibert, N., Smith, D.E. and Zuber, M.T. (1998). Oceans in the past history of Mars: Tests for their presence using Mars Orbiter Laser Altimeter (MOLA) data. Geophysical Research Letters 25, 4401-4404.
  2. Malin, M. C. and Edgett, K. S. (1999). Oceans or seas in the Martian northern lowlands: High resolution imaging tests of proposed coastlines. Geophysical Research Letters 26, 3049-3052.
  3. ^ Carlotto, M. J. (1988) Digital Imagery Analysis of Unusual Martian Surface Features. Applied Optics 27, 1926-1933.
  4. "The Face on Mars, Viking Project". NASA website. Retrieved 2007-04-26.
  5. Mission to Mars: Viking Orbiter Images of Mars website, NASA Jet Propulsion Laboratory; raw data in IMQ (ImageQ) format can be downloaded from these links: 35A72, 70A13, 561A25, 673B56, 673B54, 753A33, 753A34. Retrieved on 20 September 2007.
  6. "Cydonia - the face on Mars, 3D rendering of Mars Express imagery". ESA website. Retrieved 2007-04-26.
  7. "Popular Landform in Cydonia Region". HiRISE website. Retrieved 2007-04-26.
  8. "Cydonia's 'Face on Mars' in 3D animation using Mars Global Surveyor imagery". ESA website. Retrieved 2007-04-26.
  9. For example: Film - Mission to Mars (2000); TV series - The X-Files ("Space", 1993), Futurama ("Where The Buggalo Roam", 2002); Videogames - Zak McKracken (1988), X-COM: UFO Defense (1993); Music - Telemetry of a Fallen Angel by Cruxshadows (1995), "Knights of Cydonia" by Muse (2006).

External links

Astronomy

"Face on Mars" as artifact

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