World Library  
Flag as Inappropriate
Email this Article

Cydonia Mensae


Cydonia Mensae

Coordinates: 40°44′N 9°28′W / 40.74°N 9.46°W / 40.74; -9.46

Cydonia /sɨˈdniəˌsˈdniə/ is a region on the planet Mars, and has attracted both scientific[1] and popular interest.[2][3] The name originally referred to the albedo feature (distinctively coloured area) that was visible from Earthbound telescopes. The area borders plains of Acidalia Planitia and the Arabia Terra highlands.[4] The area includes the Mars regions: "Cydonia Mensae", an area of flat-topped mesa-like features, "Cydonia Colles", a region of small hills or knobs, and "Cydonia Labyrinthus", a complex of intersecting valleys.[5][6] As with other albedo features on Mars, the name Cydonia was drawn from classical antiquity, in this case from Kydonia, a historic polis (or "city-state") on the island of Crete.[7] Cydonia contains the "Face on Mars" feature about half-way between Arandas Crater and Bamberg Crater.[4]


External images
Scale: 13.7 m/pixel

Cydonia 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[8] and that Cydonia may once have been a coastal zone.[9]

"Face on Mars"

Cydonia was first imaged in detail by the Viking 1 and Viking 2 orbiters. Eighteen images of the Cydonia region were taken by the orbiters, of which seven have resolutions better than 250 m/pixel (820 ft/pixel). The other eleven images have resolutions that are lower than 550 m/pixel (1800 ft/pixel) and are of limited use for studying surface features. 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 distinct images. The Mission to Mars: Viking Orbiter Images of Mars CD-ROM set image numbers for these are: 035A72 (VO-1010), 070A13 (VO-1011), 561A25 (VO-1021), 673B54 & 673B56 (VO-1063), and 753A33 & 753A34 (VO-1028).[11][12]

In one of the images taken by Viking 1 on July 25, 1976, a 2 km (1.2 miles) long Cydonian mesa, situated at 40.75° north latitude and 9.46° west longitude,[13] had the appearance of a humanoid face. When the image was originally acquired, Viking chief scientist Gerry Soffen dismissed the "Face on Mars" in image 035A72[14] as a "trick of light and shadow".[15][16] However, a second image, 070A13, also shows the "face", and was acquired 35 Viking orbits later at a different sun-angle from the 035A72 image. This latter discovery was made independently by Vincent DiPietro and Gregory Molenaar, two computer engineers at NASA's Goddard Space Flight Center. DiPietro and Molenaar discovered the two misfiled images, Viking frames 035A72 and 070A13, while searching through NASA archives.[17]

Later imagery

More than 20 years after the Viking 1 images were taken, a succession of spacecraft visited Mars and collected new data from the Cydonia region. These spacecraft have included NASA's Mars Global Surveyor (1997–2006) and Mars Reconnaissance Orbiter (2006-),[18] and the European Space Agency's Mars Express probe (2003-).[19] 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. By combining 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 it has been possible to create a three-dimensional representation of the "Face on Mars".[20]

Mars Reconnaissance Orbiter image by its HiRISE camera of the "Face on Mars".
Viking Orbiter image inset in bottom right corner.
Mars Global Surveyor image (MOC camera) of the same feature.

Since it was originally first imaged, the "face" has been near-universally accepted as an optical illusion, an example of the psychological phenomenon of pareidolia.[21] After analysis of the higher resolution Mars Global Surveyor data NASA 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 illumination".[22] Similar optical illusions can be found in the geology of Earth;[23] examples include the Old Man of the Mountain, the Pedra da Gávea, the Old Man of Hoy, Stac Levenish and the Badlands Guardian.[24]


The Cydonia facial pareidolia inspired individuals and organizations interested in extraterrestrial intelligence and visitations to Earth, and the images were published in this context in 1977.[27][28] Some commentators, most notably Richard C. Hoagland, believe the "Face on Mars" 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.[29]

While accepting the "face" as a subject for scientific study, astronomer Carl Sagan criticized much of the speculation concerning it in the chapter "The Man in the Moon and the Face on Mars" in his book The Demon-Haunted World.[30][31] The "face" is also a common topic among skeptics groups, who use it as an example of credulity.[32] They point out that there are other faces on Mars, often much clearer, but their images do not elicit the same level of study. An example is the Galle Crater, which can show a rendition of a smiley, or a profile of Kermit the Frog, or other celebrities.[33] Discover magazine's "Skeptical Eye" column ridiculed Hoagland's claims, asking if he believed the aliens were fans of Sesame Street.[17][34]

In popular culture

As a result of the speculation concerning their artificial origins, Cydonia and the "Face on Mars" appear frequently in popular culture, including feature films, television series, video games, comic books, and even popular music. For example: films featuring the structures include Mission to Mars (2000); TV series include The X-Files ("Space", 1993), Invader Zim ("Battle of the Planets", 2002), Futurama ("Where The Buggalo Roam", 2002), Phineas and Ferb ("Unfair Science Fair", 2009); video games include Zak McKracken (1988), Final Fantasy IV (1991), X-COM: UFO Defense (1993); comic books include Martian Manhunter (#1, 1998); and music includes Telemetry of a Fallen Angel by The Crüxshadows (1995), "Knights of Cydonia" by Muse (2006), "Hunting and Gathering (Cydonia)" by Sunn O))) (2009).

See also


Further reading

External links

  • ESA's overview of features in Cydonia region
  • Viking Project Information, NASA
  • Past Missions: Viking, NASA
  • Mars Express, ESA
  • Mars Express: Home, NASA
  • Mars Global Surveyor, NASA
  • Astronomy Picture of the Day: 2006 September 25, "Mars Express Close-Up of the Face on Mars"
  • Astronomy Picture of the Day: 2006 September 26, "Mars Express: Return to Cydonia"
Non-Space Agency
  • Freie Universität Berlin - Mars Express orbiter data (orbit 3253)
  • The "Face on Mars")
  • Google Mars
  • MarsQuest Online.
  • NASA World Wind, among others

This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Hawaii eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.