Ravine-like channels on Mars are something of a puzzle.
are something of a puzzle. They look like the gullies in Antarctica caused by melting glaciers, but the elevated locations of many of the features aren't places we'd expect to find recently flowing water.as an alternative hypothesis, but a new study by a team of scientists in the US suggests that in the right conditions, liquid water really could do the job. What's more, it could've happened recently as far as geological timescales go, maybe just 630,000 years ago.
The calculations run by the research team shed more light on how these gullies start, how much erosion they cause, and how far they can stretch. The team was able to fit its model to data on Mars' Terra Sirenum region, matching it up to periods when it's thought that gullies quickly expanded in the area.
"Our study shows that the global distribution of gullies is better explained by liquid water over the last million years,""Water explains the elevation distribution of gullies in ways that COcannot. This means that Mars has been able to create liquid water in enough volume to erode channels within the last million years, which is very recent on the scale of Mars geologic history.
Eventually, the planet will go back to being at a 35 degree angle, allowing localized patches of liquid water to flow once more.
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