'They look very Earth-like, but they're on Mars, so how could they form there?'
Gullies on Mars may have formed when the Red Planet was highly tilted on its side, triggering dramatic shifts in climate that sent water cascading down slopes to carve out ravines, a new study finds.in 2000. These strongly resembled channels that form on Earth in the Dry Valleys of Antarctica, which are carved by water from melting glaciers. As such, the Martian ravines hinted that water once flowed on Mars, and maybe still does at times.
Another possibility is that these gullies formed in the past, when the climate of Mars was more favorable to small amounts of liquid water surviving on the the Martian surface. This might explain the height of the gullies — meltwater from glaciers could have flowed down slopes, chiseling out channels.
The gullies seen here are one of numerous examples on Mars, showing water flowing in the ancient past.
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