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Mars in pictures: NASA portrait reveals ancient volcanic rock and sand dunes | Science | News

In another HiRISE picture dated October 14, astronomers showed the cross-section of a canyon system in the Valles Marineris.

The Mars picture features snaking sand dunes and ripples, also known as bedrooms.

The HiRISE team said: “Some areas display more modern bedforms, often termed mega-ripples, which have likely been active over long timescales and have migrated in the recent past.

“Other areas along the canyon wall have larger bedforms that show a very different appearance.

“Although they have a spacing that would make them similar to typical Martian sand dunes, many display superposed craters, indicating they have not migrated for a very long time, possibly hundreds of thousands of years.”

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