Very (Martian 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.

The crater was named after American astronomer Frank Washington Very.

[1] 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.

[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.

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.