Very (Martian crater)
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Very is a
crater Crater may refer to: Landforms *Impact crater, a depression caused by two celestial bodies impacting each other, such as a meteorite hitting a planet *Explosion crater, a hole formed in the ground produced by an explosion near or below the surfac ...
on
Mars Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System, only being larger than Mercury (planet), Mercury. In the English language, Mars is named for the Mars (mythology), Roman god of war. Mars is a terr ...
, located south of the planet's equator in the heavily cratered highlands of
Terra Sirenum Terra Sirenum is a large region in the southern hemisphere of the planet Mars. It is centered at and covers 3900 km at its broadest extent. It covers latitudes 10 to 70 South and longitudes 110 to 180 W. Terra Sirenum is an upland area nota ...
in the
Phaethontis quadrangle The Phaethontis quadrangle is one of a series of 30 quadrangle maps of Mars used by the United States Geological Survey (USGS) Astrogeology Research Program. The Phaethontis quadrangle is also referred to as MC-24 (Mars Chart-24). The name com ...
at 49.2°S and 177.1°W. It measures approximately in diameter. The crater was named after American astronomer
Frank Washington Very Frank Washington Very (February 12, 1852 – November 23, 1927) was a U.S. astronomer, astrophysicist, and meteorologist. He was born at Salem, Massachusetts, and educated at Massachusetts Institute of Technology (1873) where he taught physic ...
.


Description

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,Malin, M., Edgett, K. 2000. "Evidence for recent groundwater seepage and surface runoff on Mars". ''Science'' 288, 2330–2335. researchers began to image many gullies over and over, looking for possible changes. By 2006, some changes were found. Later, with further analysis it was determined that the changes could have occurred by dry granular flows rather than being driven by flowing water. With continued observations many more changes were found in
Gasa GASA Group (''Gartnernes Salgsforeninger''; "co-operative marketing organisations") is a Danish company that imports and exports flowers, fruits, and vegetables. Founded in 1929 as a fruit, flowers and vegetable auction co-operative, the mul ...
Crater and others. 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. In some years frost, perhaps as thick as .


See also

*
List of craters on Mars __NOTOC__ This is a list of craters on Mars. Impact craters on Mars larger than exist by the hundreds of thousands, but only about one thousand of them have names. Names are assigned by the International Astronomical Union after petitioning by ...


References


External links

*
Newton Crater


{{Portal bar, Solar System Impact craters on Mars Phaethontis quadrangle