This article is about the crater on Mars. For the crater on the Moon, see Very (lunar crater).
Very is a crater on Mars, located south of the planet's equator in the heavily cratered highlands of Terra Sirenum in the Phaethontis quadrangle at 49.2°S and 177.1°W. It measures approximately 114.81 kilometres (71.34 mi) in diameter. The crater was named after American astronomer Frank Washington Very.[1]
Eastern side of Very Crater, as seen by CTX camera (on Mars Reconnaissance Orbiter).Channel on floor of Very Crater, as seen by CTX camera (on Mars Reconnaissance Orbiter). Gullies are also visible in a smaller crater to the south (bottom). Note this is an enlargement of the previous image of Very.
On the basis of their form, aspects, positions, and location amongst and apparent interaction with features thought to be rich in water ice, many researchers believed that the processes carving the gullies involve liquid water. However, this remains a topic of active research. As soon as gullies were discovered,[2] researchers began to image many gullies over and over, looking for possible changes. By 2006, some changes were found.[3] Later, with further analysis it was determined that the changes could have occurred by dry granular flows rather than being driven by flowing water.[4][5][6] With continued observations many more changes were found in Gasa Crater and others.[7] With more repeated observations, more and more changes have been found; since the changes occur in the winter and spring, experts are tending to believe that gullies were formed from dry ice. Before-and-after images demonstrated the timing of this activity coincided with seasonal carbon-dioxide frost and temperatures that would not have allowed for liquid water. When dry ice frost changes to a gas, it may lubricate dry material to flow especially on steep slopes.[8][9][10] In some years frost, perhaps as thick as one metre (3 ft 3 in).
^Malin, M., Edgett, K. 2000. "Evidence for recent groundwater seepage and surface runoff on Mars". Science 288, 2330–2335.
^Malin, M., K. Edgett, L. Posiolova, S. McColley, E. Dobrea. 2006. "Present-day impact cratering rate and contemporary gully activity on Mars". Science 314, 1573–1577.
^Kolb, et al. 2010. "Investigating gully flow emplacement mechanisms using apex slopes". Icarus 2008, 132–142.
^McEwen, A. et al. 2007. "A closer look at water-related geological activity on Mars". Science 317, 1706–1708.
^Pelletier, J., et al. 2008. "Recent bright gully deposits on Mars wet or dry flow?" Geology 36, 211–214.
^NASA/Jet Propulsion Laboratory. "NASA orbiter finds new gully channel on Mars". ScienceDaily. 22 March 2014.
^"NASA Spacecraft Observes Further Evidence of Dry Ice Gullies on Mars". NASA Jet Propulsion Laboratory (JPL). Retrieved 2021-01-21.
^"HiRISE | Activity in Martian Gullies (ESP_032078_1420)". hirise.lpl.arizona.edu. Retrieved 2021-01-21.
^July 2014, Nola Taylor Redd 16. "Gullies on Mars Carved by Dry Ice, Not Water". Space.com. Retrieved 2021-01-21.{{cite web}}: CS1 maint: numeric names: authors list (link)
External linksedit
NASA Astronomy Picture of the Day: Newton Crater: Evidence for Recent Water on Mars (26 June 2000)
very, martian, crater, this, article, about, crater, mars, crater, moon, very, lunar, crater, very, crater, mars, located, south, planet, equator, heavily, cratered, highlands, terra, sirenum, phaethontis, quadrangle, measures, approximately, kilometres, diame. This article is about the crater on Mars For the crater on the Moon see Very lunar crater Very is a crater on Mars located south of the planet s equator in the heavily cratered highlands of Terra Sirenum in the Phaethontis quadrangle at 49 2 S and 177 1 W It measures approximately 114 81 kilometres 71 34 mi in diameter The crater was named after American astronomer Frank Washington Very 1 Very CraterTopographic location map of Very CraterPlanetMarsCoordinates49 12 S 177 06 W 49 2 S 177 1 W 49 2 177 1QuadranglePhaethontisDiameter114 81 km 71 34 mi EponymFrank Washington VeryEastern side of Very Crater as seen by CTX camera on Mars Reconnaissance Orbiter Channel on floor of Very Crater as seen by CTX camera on Mars Reconnaissance Orbiter Gullies are also visible in a smaller crater to the south bottom Note this is an enlargement of the previous image of Very Contents 1 Description 2 See also 3 References 4 External linksDescription editOn the basis of their form aspects positions and location amongst and apparent interaction with features thought to be rich in water ice many researchers believed that the processes carving the gullies involve liquid water However this remains a topic of active research As soon as gullies were discovered 2 researchers began to image many gullies over and over looking for possible changes By 2006 some changes were found 3 Later with further analysis it was determined that the changes could have occurred by dry granular flows rather than being driven by flowing water 4 5 6 With continued observations many more changes were found in Gasa Crater and others 7 With more repeated observations more and more changes have been found since the changes occur in the winter and spring experts are tending to believe that gullies were formed from dry ice Before and after images demonstrated the timing of this activity coincided with seasonal carbon dioxide frost and temperatures that would not have allowed for liquid water When dry ice frost changes to a gas it may lubricate dry material to flow especially on steep slopes 8 9 10 In some years frost perhaps as thick as one metre 3 ft 3 in See also editList of craters on MarsReferences edit Gazetteer of Planetary Nomenclature Very usgs gov International Astronomical Union Retrieved 5 March 2015 Malin M Edgett K 2000 Evidence for recent groundwater seepage and surface runoff on Mars Science 288 2330 2335 Malin M K Edgett L Posiolova S McColley E Dobrea 2006 Present day impact cratering rate and contemporary gully activity on Mars Science 314 1573 1577 Kolb et al 2010 Investigating gully flow emplacement mechanisms using apex slopes Icarus 2008 132 142 McEwen A et al 2007 A closer look at water related geological activity on Mars Science 317 1706 1708 Pelletier J et al 2008 Recent bright gully deposits on Mars wet or dry flow Geology 36 211 214 NASA Jet Propulsion Laboratory NASA orbiter finds new gully channel on Mars ScienceDaily 22 March 2014 NASA Spacecraft Observes Further Evidence of Dry Ice Gullies on Mars NASA Jet Propulsion Laboratory JPL Retrieved 2021 01 21 HiRISE Activity in Martian Gullies ESP 032078 1420 hirise lpl arizona edu Retrieved 2021 01 21 July 2014 Nola Taylor Redd 16 Gullies on Mars Carved by Dry Ice Not Water Space com Retrieved 2021 01 21 a href Template Cite web html title Template Cite web cite web a CS1 maint numeric names authors list link External links editNASA Astronomy Picture of the Day Newton Crater Evidence for Recent Water on Mars 26 June 2000 Newton Crater Solar Views Portal nbsp Solar System Retrieved from https en wikipedia org w index php title Very Martian crater amp oldid 1177435066, wikipedia, wiki, book, books, library,
