Water May Not Have Formed Mars' Recent Gullies

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Scientists have interpreted gullies around a martian crater seen in this Mars Orbital Camera image as evidence of recent running water. (NASAMalin Space Systems photo)
Scientists have interpreted gullies around a martian crater seen in this Mars Orbital Camera image as evidence of recent running water. (NASA/Malin Space Systems photo)

If you're a scientist studying the surface of Mars, few discoveries could be more exciting than seeing recent gullies apparently formed by running water. And that's what scientists believed they saw in Mars Orbital Camera (MOC) images five years ago. They published a paper in Science on MOC images that show small, geologically young ravines. They concluded that the gullies are evidence that liquid water flowed on Mars' surface sometime within the last million years.


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