It measures 127 kilometres (79 mi) in diameter and was named after American astronomers Vesto and Earl Slipher.

Martian gullies are small, incised networks of narrow channels and their associated downslope sediment deposits, found on the planet of Mars.

First discovered on images from Mars Global Surveyor, they occur on steep slopes, especially on the walls of craters.

[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.