Wikipedia

Utopia Planitia

Utopia Planitia (Greek and Latin: "Utopia Land Plain") is a large plain[2] within Utopia, the largest recognized impact basin on Mars[a] and in the Solar System with an estimated diameter of 3,300 km (2,100 mi).[1] It is the Martian region where the Viking 2 lander touched down and began exploring on September 3, 1976, and the Zhurong rover touched down on May 14, 2021, as a part of the Tianwen-1 mission.[4][5] It is located at the antipode of Argyre Planitia, centered at 46°42′N 117°30′E / 46.7°N 117.5°E / 46.7; 117.5.[2] It is also in the Casius quadrangle, Amenthes quadrangle, and the Cebrenia quadrangle of Mars. The region is in the broader North Polar/Borealis Basin that covers most of the Northern Hemisphere of Mars.

Utopia Planitia
}
Map of the lower and mid-latitudes of Mars, with Utopia visible in dark blue in the top right
Feature typeImpact basin
LocationNortheast of Isidis Planitia, northwest of Aetheria
Coordinates46°42′N 117°30′E / 46.7°N 117.5°E / 46.7; 117.5
Diameter3,300 km (2,100 mi).[1]
Frosted terrian on Utopia Planitia, taken by the Viking 2 lander in 1979

The Utopia basin is estimated to have formed around 4.3-4.1 billion years ago.[6][7] The impactor was likely around 400–700 kilometres (250–430 mi) in diameter.[8][9][10] The basin was subsequently mostly filled in, resulting in a mascon (a strong positive gravity anomaly) detectable by orbiting satellites.[11][12]

Many rocks at Utopia Planitia appear perched, as if wind removed much of the soil at their bases.[13][14] A hard surface crust is formed by solutions of minerals moving up through soil and evaporating at the surface.[15] Some areas of the surface exhibit scalloped topography, a surface that looks like it was carved out by an ice cream scoop. This surface is thought to have formed by the degradation of an ice-rich permafrost.[16] Many features that look like pingos on the Earth are found in Utopia Planitia (~35–50° N; ~80–115° E).[17]

On November 22, 2016, NASA reported finding a large amount of underground ice in the Utopia Planitia region. The volume of water detected has been estimated to be equivalent to the volume of water in Lake Superior.[18][19][20]

Scalloped topography

edit
Main articles: Scalloped topography and Water on Mars
Utopia Planitia
Scalloped terrain led to the discovery of a large amount of underground ice
enough water to fill Lake Superior[18][19][20]
 
Martian terrain
 
Map of terrain

Scalloped topography is common in the mid-latitudes of Mars, between 45° and 60° north and south. It is particularly prominent in the region of Utopia Planitia[21][22] in the northern hemisphere and in the region of Peneus and Amphitrites Patera[23][24] in the southern hemisphere. Such topography consists of shallow, rimless depressions with scalloped edges, commonly referred to as scalloped depressions or simply scallops. Scalloped depressions can be isolated or clustered and sometimes seem to coalesce. A typical scalloped depression displays a gentle equator-facing slope and a steeper pole-facing scarp. This topographic asymmetry is probably due to differences in insolation. Scalloped depressions are believed to form from the removal of subsurface material, possibly interstitial ice, by sublimation. This process may still be happening at present.[25]

  •  
    Scalloped ground, as seen by HiRISE under HiWish program. A study published in Icarus found that the landforms of scalloped topography can be made by the subsurface loss of water ice by sublimation under current Martian climate conditions. Their model predicts similar shapes when the ground has large amounts of pure ice, up to many tens of meters in depth.[26]
  •  
    Close up of scalloped ground, as seen by HiRISE under HiWish program. Surface is divided into polygons; these forms are common where ground freezes and thaws. Note: this is an enlargement of a previous image.
  •  
    Scalloped ground, as seen by HiRISE under HiWish program.
  •  
    Close-up of scalloped ground, as seen by HiRISE under HiWish program. Surface is divided into polygons; these forms are common where ground freezes and thaws. Note: this is an enlargement of a previous image.

Pedestal craters

edit
Main article: Pedestal craters
  •  
    Pedestal crater, as seen by HiRISE under HiWish program The ejecta is not symmetrical around crater because the asteroid came at a low angle out of the North East. The ejecta protected the underlying material from erosion; hence the crater looks elevated. The location is Casius quadrangle.
  •  
    Close-up of East side (right side) of previous image of pedestal crater showing polygons on lobe. Since the margin of the crater has lobes and polygons, it is believed there is ice under the protective top. Picture taken with HiRISE under HiWish program. Note: this is an enlargement of the previous image.

Polygonal patterned ground

edit
Main article: Polygonal patterned ground

Polygonal, patterned ground is quite common in some regions of Mars.[27][28][29][30][31][32] It is commonly believed to be caused by the sublimation of ice from the ground. Sublimation is the direct change of solid ice to a gas. This is similar to what happens to dry ice on the Earth. Places on Mars that display polygonal ground may indicate where future colonists can find water ice. Patterned ground forms in a mantle layer, called latitude dependent mantle, that fell from the sky when the climate was different.[33][34][35][36]

  •  
    Low center polygons, shown with arrows, as seen by HiRISE under HiWish program Location is Casius quadrangle. Image was enlarged with HiView.
  •  
    High center polygons, shown with arrows, as seen by HiRISE under HiWish program. Location is Casius quadrangle. Image enlarged with HiView.
  •  
    Scalloped terrain labeled with both low center polygons and high center polygons, as seen by HiRISE under HiWish program. Location is Casius quadrangle. Image enlarged with HiView.
  •  
    Low center polygons, as seen by HiRISE under HiWish program. Location is Casius quadrangle. Image enlarged with HiView.
  •  
    High and low center polygons, as seen by HiRISE under HiWish program. Location is Casius quadrangle. Image enlarged with HiView.

Other features in Utopia Planitia

edit
  •  
    MOLA map showing boundaries for Utopia Planitia and other regions
  •  
    Holes and hollows on crater floor in Utopia Planitia, as seen by HiRISE under HiWIsh program. These shapes may have resulted from ice leaving the ground.
  •  
    Glacier on a crater floor, as seen by HiRISE under HiWish program. The cracks in the glacier may be crevasses. There is also a gully system on the crater wall.
  •  
    Layered mesa, as seen by HiRISE under HiWish program
  •  
    Context for next image of layers along Hrad Vallis, as seen by CTX. Photo labeled with layers, streamlined forms, and arrow indicating direction water flowed.
  •  
    Layers exposed along Hrad Vallis, as seen by HiRISE under HiWish program
edit
 
Viking 2 lander image of North Utopia Planitia.
edit

In the Star Trek media franchise, Utopia Planitia—both on Mars' surface and a space station in areosynchronous orbit above it—is the site of a major United Federation of Planets shipyard, the Utopia Planitia Fleet Yards. Ships such as the USS Enterprise-D, USS Defiant, USS Voyager and USS Sao Paulo were built there.[37]

Interactive Mars map

edit
 Acheron FossaeAcidalia PlanitiaAlba MonsAmazonis PlanitiaAonia PlanitiaArabia TerraArcadia PlanitiaArgentea PlanumArgyre PlanitiaChryse PlanitiaClaritas FossaeCydonia MensaeDaedalia PlanumElysium MonsElysium PlanitiaGale craterHadriaca PateraHellas MontesHellas PlanitiaHesperia PlanumHolden craterIcaria PlanumIsidis PlanitiaJezero craterLomonosov craterLucus PlanumLycus SulciLyot craterLunae PlanumMalea PlanumMaraldi craterMareotis FossaeMareotis TempeMargaritifer TerraMie craterMilankovič craterNepenthes MensaeNereidum MontesNilosyrtis MensaeNoachis TerraOlympica FossaeOlympus MonsPlanum AustralePromethei TerraProtonilus MensaeSirenumSisyphi PlanumSolis PlanumSyria PlanumTantalus FossaeTempe TerraTerra CimmeriaTerra SabaeaTerra SirenumTharsis MontesTractus CatenaTyrrhena TerraUlysses PateraUranius PateraUtopia PlanitiaValles MarinerisVastitas BorealisXanthe Terra
 Interactive image map of the global topography of Mars. Hover over the image to see the names of over 60 prominent geographic features, and click to link to them. Coloring of the base map indicates relative elevations, based on data from the Mars Orbiter Laser Altimeter on NASA's Mars Global Surveyor. Whites and browns indicate the highest elevations (+12 to +8 km); followed by pinks and reds (+8 to +3 km); yellow is 0 km; greens and blues are lower elevations (down to −8 km). Axes are latitude and longitude; Polar regions are noted.


See also

edit

Notes

edit
  1. ^ Officially, Utopia is an albedo feature.[3]

References

edit
  1. ^ a b McGill, G. E. (1989-03-10). "Buried topography of Utopia, Mars: Persistence of a giant impact depression". Journal of Geophysical Research. 94: 2753–2759. Bibcode:1989JGR....94.2753M. doi:10.1029/JB094iB03p02753.
  2. ^ a b "Utopia Planitia". Gazetteer of Planetary Nomenclature. USGS Astrogeology Science Center. Retrieved 2015-03-10.
  3. ^ "Utopia". Gazetteer of Planetary Nomenclature. USGS Astrogeology Science Center.
  4. ^ "China succeeds on country's first Mars landing attempt with Tianwen-1". nasaspaceglight.com. 15 May 2021. Retrieved May 15, 2021.
  5. ^ "China's first Mars rover Tianwen-1 launches this week. Here's what it will do". Space.com. 21 July 2020.
  6. ^ Robbins, Stuart J. (2022-12-01). "Inconsistency between the Ancient Mars and Moon Impact Records of Megameter-scale Craters". The Planetary Science Journal. 3 (12): 274. doi:10.3847/PSJ/aca282. ISSN 2632-3338.
  7. ^ Frey, Herbert (July 2008). "Ages of very large impact basins on Mars: Implications for the late heavy bombardment in the inner solar system". Geophysical Research Letters. 35 (13). doi:10.1029/2008GL033515. ISSN 0094-8276.
  8. ^ Arkani-Hamed, Jafar (April 2005). "Giant impact basins trace the ancient equator of Mars". Journal of Geophysical Research: Planets. 110 (E4). doi:10.1029/2004JE002343. ISSN 0148-0227.
  9. ^ Ruedas, Thomas; Breuer, Doris (May 2018). ""Isocrater" impacts: Conditions and mantle dynamical responses for different impactor types". Icarus. 306: 94–115. arXiv:1802.08578. doi:10.1016/j.icarus.2018.02.005.
  10. ^ Branco, Hely C.; Miljkovic, Katarina; Plesa, Ana‐Catalina (April 2024). "New Numerically Derived Scaling Relationships for Impact Basins on Mars". Journal of Geophysical Research: Planets. 129 (4). doi:10.1029/2023JE008217. ISSN 2169-9097.
  11. ^ Klokočník, Jaroslav; Kletetschka, Gunther; Kostelecký, Jan; Bezděk, Aleš (December 2023). "Gravity aspects for Mars". Icarus. 406: 115729. doi:10.1016/j.icarus.2023.115729.
  12. ^ Searls, Mindi L.; Banerdt, W. Bruce; Phillips, Roger J. (August 2006). "Utopia and Hellas basins, Mars: Twins separated at birth". Journal of Geophysical Research: Planets. 111 (E8). doi:10.1029/2005JE002666. ISSN 0148-0227.
  13. ^ Mutch, T. et al. 1976. "The Surface of Mars: The View from the Viking 2 Lander". Science: 194. 1277–1283.
  14. ^ Hartmann, W. 2003. A Traveler's Guide to Mars. Workman Publishing. New York.
  15. ^ Arvidson, R. A. Binder, and K. Jones. 1976. "The Surface of Mars". Scientific American: 238. 76–89.
  16. ^ Sejourne, A. et al. 2012. Evidence of an eolian ice-rich and stratified permafrost in Utopia Planitia, Mars. Icarus. 60:248–254.
  17. ^ Soare, E., et al. 2019. Possible (closed system) pingo and ice-wedge/thermokarst complexes at the mid latitudes of Utopia Planitia, Mars. Icarus. doi:10.1016/j.icarus.2019.03.010
  18. ^ a b Staff (November 22, 2016). "Scalloped Terrain Led to Finding of Buried Ice on Mars". NASA. Retrieved November 23, 2016.
  19. ^ a b "Lake of frozen water the size of New Mexico found on Mars – NASA". The Register. November 22, 2016. Retrieved November 23, 2016.
  20. ^ a b "Mars Ice Deposit Holds as Much Water as Lake Superior". NASA. November 22, 2016. Retrieved November 23, 2016.
  21. ^ Lefort, A.; Russell, P. S.; Thomas, N.; McEwen, A. S.; Dundas, C. M.; Kirk, R. L. (2009). "Observations of periglacial landforms in Utopia Planitia with the High Resolution Imaging Science Experiment (HiRISE)". Journal of Geophysical Research. 114 (E4): E04005. Bibcode:2009JGRE..114.4005L. doi:10.1029/2008JE003264.
  22. ^ Morgenstern, A; Hauber, E; Reiss, D; van Gasselt, S; Grosse, G; Schirrmeister, L (2007). "Deposition and degradation of a volatile-rich layer in Utopia Planitia, and implications for climate history on Mars" (PDF). Journal of Geophysical Research: Planets. 112 (E6): E06010. Bibcode:2007JGRE..112.6010M. doi:10.1029/2006JE002869.
  23. ^ Lefort, A.; Russell, P.S.; Thomas, N. (2010). "Scalloped terrains in the Peneus and Amphitrites Paterae region of Mars as observed by HiRISE". Icarus. 205 (1): 259. Bibcode:2010Icar..205..259L. doi:10.1016/j.icarus.2009.06.005.
  24. ^ Zanetti, M.; Hiesinger, H.; Reiss, D.; Hauber, E.; Neukum, G. (2009). "Scalloped Depression Development on Malea Planum and the Southern Wall of the Hellas Basin, Mars" (PDF). Lunar and Planetary Science. 40. p. 2178, abstract 2178. Bibcode:2009LPI....40.2178Z.
  25. ^ "HiRISE | Scallops and Polygons in the Utopia Planitia (PSP_007173_2245)". hirise.lpl.arizona.edu.
  26. ^ Dundas, C., S. Bryrne, A. McEwen. 2015. Modeling the development of martian sublimation thermokarst landforms. Icarus: 262, 154-169.
  27. ^ Kostama, V.-P., M. Kreslavsky, Head, J. 2006. Recent high-latitude icy mantle in the northern plains of Mars: Characteristics and ages of emplacement. Geophys. Res. Lett. 33 (L11201). doi:10.1029/2006GL025946.
  28. ^ Malin, M., Edgett, K. 2001. Mars Global Surveyor Mars Orbiter Camera: Interplanetary cruise through primary mission. J. Geophys. Res. 106 (E10), 23429–23540.
  29. ^ Milliken, R., et al. 2003. Viscous flow features on the surface of Mars: Observations from high-resolution Mars Orbiter Camera (MOC) images. J. Geophys. Res. 108 (E6). doi:10.1029/2002JE002005.
  30. ^ Mangold, N. 2005. High latitude patterned grounds on Mars: Classification, distribution and climatic control. Icarus 174, 336–359.
  31. ^ Kreslavsky, M., Head, J. 2000. Kilometer-scale roughness on Mars: Results from MOLA data analysis. J. Geophys. Res. 105 (E11), 26695–26712.
  32. ^ Seibert, N., J. Kargel. 2001. Small-scale martian polygonal terrain: Implications for liquid surface water. Geophys. Res. Lett. 28 (5), 899–902. S
  33. ^ Hecht, M. 2002. Metastability of water on Mars. Icarus 156, 373–386
  34. ^ Mustard, J., et al. 2001. Evidence for recent climate change on Mars from the identification of youthful near-surface ground ice. Nature 412 (6845), 411–414.
  35. ^ Kreslavsky, M.A., Head, J.W., 2002. High-latitude Recent Surface Mantle on Mars: New Results from MOLA and MOC. European Geophysical Society XXVII, Nice.
  36. ^ Head, J.W., Mustard, J.F., Kreslavsky, M.A., Milliken, R.E., Marchant, D.R., 2003. Recent ice ages on Mars. Nature 426 (6968), 797–802.
  37. ^ Okuda, Michael; Denise Okuda & Debbie Mirek (1999). The Star Trek Encyclopedia. Pocket Books. ISBN 0-671-53609-5.
edit
Retrieved from "https://en.wiki.x.io/w/index.php?title=Utopia_Planitia&oldid=1257627328"