Cydonia (Mars)

Short description: Area of Mars

Small part of the Cydonia region, taken by the Viking 1 orbiter and released by NASA/JPL on July 25, 1976

Cydonia (/sɪˈdoʊniə/, /saɪˈdoʊniə/) is a region on the planet Mars that 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 the plains of Acidalia Planitia and the highlands of Arabia Terra.[4] The region includes the named features 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 (Ancient Greek:; Latin: Cydonia), a historic polis (city state) on the island of Crete.[7] Cydonia contains the "Face on Mars", located about halfway between the craters Arandas and Bamberg.[4]

## Contents

* 1 Location
* 2 "Face on Mars"
* 2.1 Later imagery
* 2.2 Speculation
* 3 Interactive Mars map
* 4 See also
* 5 References
* 6 External links

## Location

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] It is in the Mare Acidalium quadrangle.

Picture of the Cydonia region taken in 2006 by The European Space Agency's satellite Mars Express. "Face on Mars" is just below the center.

## "Face on Mars"

Cropped version of the original batch-processed image (#035A72) of the "Face on Mars". The black dots that give the image a speckled appearance are data errors (salt-and-pepper noise).[10] Second Viking 1 image of the Cydonia region on Mars. Labeled 070A13

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 worse 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 two-kilometre-long (1.2 mi) 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] 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] The resolution of these images was of about 50 m/pixel.[18]

### Later imagery

More than 20 years after the Viking 1 images were taken, a succession of spacecraft visited Mars and made new observations of the Cydonia region. These spacecraft have included NASA's Mars Global Surveyor (1997–2006) and Mars Reconnaissance Orbiter (2006–),[19] and the European Space Agency's Mars Express probe (2003–).[20] 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".[21]

Mars Reconnaissance Orbiter image by its HiRISE camera of the "Face on Mars" (2007). Viking Orbiter image inset in bottom right corner (1976).

Mars Global Surveyor image (MOC camera) of the same feature (2001).

One of many formations in Cydonia, this one is sometimes called the "D & M pyramid".[22][23]

Since it was originally first imaged, the face has been accepted by scientists as an optical illusion, an example of the psychological phenomenon of pareidolia.[24][25][26] 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".[27] Similar optical illusions can be found in the geology of Earth;[28] examples include the Old Man of the Mountain, the Romanian Sphinx, Giewont, the Pedra da Gávea, the Old Man of Hoy, Stac Levenish, Sleeping Ute, and the Badlands Guardian.[29]

### Speculation

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.[30][31] 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.[32]

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 1995 book The Demon-Haunted World.[33][34] The shape-from-shading work by Mark J. Carlotto was used by Sagan in a chapter of his famous Cosmos series.[35] In 1998 a news article about the "Space Face" quoted a scientist talking about deciphering "intelligent design" in nature. A cutting of this was used by Charles Thaxton as an overhead visual for a lecture at Princeton, in his first public use of the term "intelligent design" as a substitute for creation science.[36]

The "face" is also a common topic among skeptics groups, who use it as an example of credulity.[37] They point out that there are other faces on Mars but these do not elicit the same level of study. One example is the Galle Crater, which takes the form of a smiley, while others resemble Kermit the Frog or other celebrities.[38] On this latter similarity, Discover magazine's "Skeptical Eye" column ridiculed Hoagland's claims, asking if he believed the aliens were fans of Sesame Street.[17][39]

## Interactive Mars map

discuss]])

## See also

* Apophenia
* Astronomy:Face on Moon South Pole - Region on the Moon which resembles a face
* Astronomy:Libya Montes - Highland terrain on Mars up-lifted by a giant impact, home to another "face"
* Philosophy:List of topics characterized as pseudoscience - None

## References

1. ↑ Carlotto, Mark J. (May 15, 1988). "Digital Imagery Analysis of Unusual Martian Surface Features". Applied Optics 27 (10): 1926–1933. doi:10.1364/AO.27.001926. ISSN 0003-6935. PMID 20531684. Bibcode: 1988ApOpt..27.1926C. http://carlotto.us/martianenigmas/Papers/AO1888.pdf. Retrieved April 19, 2013.
2. ↑ Whitehouse, David (May 25, 2001). "Nasa: No face – honest". BBC News (London). http://news.bbc.co.uk/1/hi/sci/tech/1351319.stm.
3. ↑ Britt, Robert Roy (September 22, 2006). "Face on Mars gets makeover". CNN.com. SPACE.com. http://www.cnn.com/2006/TECH/space/09/22/mars.face/index.html.
4. ↑ 4.0 4.1 "Cydonia – the face on Mars". ESA. September 21, 2006. http://www.esa.int/Our_Activities/Space_Science/Mars_Express/Cydonia_-_the_face_on_Mars.
5. ↑ "Planetary Names: Mars". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program. http://planetarynames.wr.usgs.gov/Page/MARS/target.
6. ↑ "Planetary Names: Feature Types". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program. http://planetarynames.wr.usgs.gov/DescriptorTerms.
7. ↑ MacDonald, T. L. (October 1971). "The origins of Martian nomenclature". Icarus 15 (2): 233–240. doi:10.1016/0019-1035(71)90077-7. Bibcode: 1971Icar...15..233M.
8. ↑ Head III, J.W.; Kreslavsky, M.; Hiesinger, H.; Ivanov, M.; Pratt, Stephen; Seibert, N.; Smith, D.E.; Zuber, M.T. (December 15, 1998). "Oceans in the past history of Mars: Tests for their presence using Mars Orbiter Laser Altimeter (MOLA) data". Geophysical Research Letters 25 (24): 4401–4404. doi:10.1029/1998GL900116. Bibcode: 1998GeoRL..25.4401H.
9. ↑ Malin, Michael C.; Edgett, Kenneth S. (October 1, 1999). "Oceans or seas in the Martian northern lowlands: High resolution imaging tests of proposed coastlines". Geophysical Research Letters 26 (19): 3049–3052. doi:10.1029/1999GL002342. Bibcode: 1999GeoRL..26.3049M.
10. ↑ "PIA01141: Geologic 'Face on Mars' Formation". NASA. 2 April 1998. http://photojournal.jpl.nasa.gov/catalog/pia01141.
11. ↑ "Mission to Mars: Viking Orbiter Images of Mars (Experiment Data Records)". PDS Imaging Node. NASA/JPL/USGS. http://pds-imaging.jpl.nasa.gov/volumes/viking.html#vkoEDR. Raw data in the IMQ (ImageQ) format can be downloaded from these links: 035A72 , 070A13 , 561A25 , 673B54 , 673B56 , 753A33, 753A34 .
12. ↑ JPL; NASA; Viking Mars Program (U.S.) (1990). Mission to Mars: Viking Orbiter Images of Mars (CD-ROM). Pasadena, CA: JPL. OCLC 232381148.
13. ↑ Rayl, A.J.S. (March 16, 2007). "The Empire Strikes Back: Europe's First Trip to Mars Brings Home 'The Gold'". The Planetary Society. http://www.planetary.org/news/2007/0317_The_Empire_Strikes_Back_Europes_First.html.
14. ↑ "Viking 1–61 (35A72)". Viking News Center (Press release). Pasadena, CA: NASA/JPL. July 31, 1976. Retrieved April 19, 2013. Caption of JPL Viking Press Release P-17384.
15. ↑ Hoagland, Richard C. (1996). The Monuments of Mars: A City on the Edge of Forever (4th ed.). Berkeley: Frog, Ltd. p. 5. ISBN 978-1-883319-30-4.
16. ↑ Paranormal News Staff (August 25, 1999). "Pixel Inversion – NASA's Misinformation on the Mars Face". Paranormal News. Jeff Behnke. http://www.paranormalnews.com/article.asp?articleID=21.
17. ↑ 17.0 17.1 Gardner, Martin (Winter 1985–1986). "The Great Stone Face and Other Nonmysteries". Skeptical Inquirer 10 (2): 14–18. https://skepticalinquirer.org/wp-content/uploads/sites/29/2015/03/p24.pdf. Retrieved April 22, 2021.
18. ↑ "Viking: 035A72". http://viewer.mars.asu.edu/planetview/inst/viking/035A72#P=035A72&T=2. "Line Resolution 0.048049 km"
19. ↑ "Popular Landform in Cydonia Region". HiRISE website. https://www.uahirise.org/PSP_003234_2210.
20. ↑ "Cydonia – the face on Mars". ESA. September 21, 2006. http://www.esa.int/Our_Activities/Space_Science/Mars_Express/Cydonia_-_the_face_on_Mars.
21. ↑ "Cydonia's 'Face on Mars' in 3D animation". ESA. October 23, 2006. http://www.esa.int/Our_Activities/Space_Science/Mars_Express/Cydonia_s_Face_on_Mars_in_3D_animation.
22. ↑ "Cydonia: Two Years Later". Malin Space Science Systems. April 5, 2000. http://mars.jpl.nasa.gov/mgs/msss/camera/images/4_5_00_cydonia/.
23. ↑ Fitzpatrick-Matthews, Keith (August 17, 2007). "Alien archaeology on Mars?: The 'D&M Pyramid". Bad Archaeology. Keith Fitzpatrick-Matthews and James Doeser. http://www.badarchaeology.com/extraterrestrials/alien-archaeology-on-mars/.
24. ↑ Britt, Robert Roy (March 18, 2004). "Scientist attacks alien claims on Mars". CNN. SPACE.com. http://www.cnn.com/2004/TECH/space/03/17/alien.debunk/index.html.
25. ↑ Normand Baillargeon, A Short Course in Intellectual Self Defense: Find Your Inner Chomsky, p. 177 (Seven Stories Press, 2007). ISBN 978-1-58322-765-7
26. ↑ Charles M. Wynn, Arthur W. Wiggins, Quantum Leaps in the Wrong Direction: Where Real Science Ends... and Pseudoscience begins (Joseph Henry Press, 2001). ISBN 0-309-17135-0
27. ↑ "The Face on Mars". Image of the Day Gallery. NASA. http://www.nasa.gov/multimedia/imagegallery/image_feature_60.html.
28. ↑ Dunning, Brian (22 April 2008). "Skeptoid #97: The Face on Mars Revealed – New high resolution imagery has proven that this hill on Mars doesn't look quite so much like a carved face after all.". https://skeptoid.com/episodes/4097.
29. ↑ "Badlands Guardian Geological Feature". Google Maps. https://maps.google.com/maps?z=16&ll=50.010083,-110.113006&spn=0.009363,0.020084&t=k&iwloc=addr.
30. ↑ Smukler, H. (1977). "Dramatic Photos of Mars: the Home of the Gods". Ancient Astronauts (January): 26.
31. ↑ Grossinger, Richard, ed (1986). Planetary Mysteries: Megaliths, Glaciers, the Face on Mars and Aboriginal Dreamtime. Berkeley: North Atlantic Books. p. 11. ISBN 978-0-938190-90-5. https://books.google.com/books?id=_hR3b8VXE0wC. Retrieved August 12, 2008.
32. ↑ Hoagland, Richard (2002). The Monuments of Mars: A City on the Edge of Forever (5 ed.). North Atlantic Books, U.S.. ISBN 978-1-58394-054-9.
33. ↑ Sagan, Carl (1995). The Demon-Haunted World: Science As a Candle in the Dark. New York: Random House. ISBN 978-0-394-53512-8.
34. ↑ McDaniel, ed (1998). The Case for the Face: Scientists Examine The Evidence for Alien Artifacts on Mars (1st ed.). Adventure Unlimited Press. ISBN 978-0-932813-59-6. https://archive.org/details/isbn_9780932813596.
35. ↑ "Carl Sagan and The Face on Mars". https://www.youtube.com/watch?v=khj0fVHwmaI.
36. ↑ Witham, Larry (2005). Where Darwin Meets the Bible: Creationists and Evolutionists in America. Oxford University Press. p. 221. ISBN 978-0-19-518281-1.
37. ↑ Posner, Gary P. (November–December 2000). "The Face Behind the 'Face' on Mars: A Skeptical Look at Richard C. Hoagland". Skeptical Inquirer 24 (6): 20–26. http://www.gpposner.com/Hoagland.html. Retrieved April 28, 2013.
38. ↑ "More 'Faces' on Mars". Tampa Bay Skeptics. http://www.tampabayskeptics.org/Mars_morefaces.html.
39. ↑ Golden, Fred (April 1985). "Skeptical Eye". Discover.

## External links

NASA or ESA

* Cydonia – the face on Mars, 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

* High-resolution images of Cydonia, Freie Universität Berlin – Mars Express orbiter data (orbit 3253)
* Discussion of MOC and "Face on Mars", Malin Space Science Systems (also, The "Face on Mars")
* "The Face on Mars" at Google Mars
* Interactive 3D "Face on Mars", Shockwave Player at MarsQuest Online.
* The exact position of the Face on Mars on Geody, provides link to NASA World Wind, among others
* Face on Mars, entry in the Skeptic's Dictionary
* Hoagland debunking at Bad Astronomy, a discussion of the science and pseudoscience of Cydonia -->
* Robbins, Stuart (May 31, 2014). "Exposing PseudoAstronomy Podcast: Episode 111 – The Cydonia Region of Mars". Exposing PseudoAstronomy Podcast. http://podcast.sjrdesign.net/shownotes_111.php.

* v
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Mars

Outline of Mars

Geography|

| Atmosphere|

* Circulation
* Climate
* Dust devil tracks
* Methane

|

Regions|

* Arabia Terra
* Cerberus (Mars)
* Cydonia
* Eridania Lake
* Iani Chaos
* Olympia Undae
* Planum Australe
* Planum Boreum
* Quadrangles
* Sinus Meridiani
* Tempe Terra
* Terra Cimmeria
* Terra Sabaea
* Tharsis
* Undae
* Ultimi Scopuli
* Vastitas Borealis

Physical
features|

* "Canals" (list)
* Canyons
* Catenae
* Chaos terrain
* Craters
* Fossae
* Gullies
* Mensae
* Labyrinthi
* Mountains
* by height
* Observed rocks
* Outflow channels
* Plains
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* Valleys
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Geology|

* Brain terrain
* Carbonates
* Chaos terrain
* Color
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* Concentric crater fill
* Dark slope streak
* Dichotomy
* Fretted terrain
* Geysers
* Glaciers
* Groundwater
* Gullies
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* Lobate debris apron
* Marsquake
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* on Earth
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* Mud cracks
* North Polar Basin
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* Recurring slope lineae (RSL)
* Ring mold craters
* Rootless cones
* Seasonal flows
* Soil
* Spherules
* Surface
* "Swiss cheese" feature
* Terrain softening
* Tharsis bulge
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* Yardangs

History|

* Amazonian
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* Classical albedo features

Astronomy|

| Moons|

* Phobos
* Stickney crater
* Monolith
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* Swift crater
* Voltaire crater

|

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* Solar eclipses on Mars
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Asteroids|

* Mars-crossers
* 2007 WD5
* Trojans
* 5261 Eureka
* 1998 VF31
* 1999 UJ7
* 2007 NS2

Comets|

* C/2013 A1 (Siding Spring) (Mars close approach, 19 Oct 2014)

Exploration|

| Concepts|

* Flyby
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|

Missions|

* List of missions to Mars

Advocacy|

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Related|

* Artificial objects on Mars
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[ ⚑ ]  40°44′N 9°28′W﻿ / ﻿40.74°N 9.46°W﻿ / 40.74; -9.46

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