Tag Archives: ripples

Uniquely martian

A piece of Mars: Now here's something that, as far as I know, can safely be labeled as "uniquely martian". These dunes (or maybe they're ripples) are ~25 m wide, and have formed from winds blowing from the upper left. ...

Nooks and crannies

A piece of Mars: This 521x391 m (1709x1283 ft) scene shows a rocky plain with many small impact craters (the bigger ones are ~45 m, or 148 ft across). Dark rippled sand fills the floors of the craters. Why? Once ...

The millipede, rewritten

A piece of Mars: Looks like a millipede, doesn't it? It's something much larger and much less poisonous. It's an ancient dune (or maybe a ripple) on Mars, that once stretched ~285 m (935 ft) from lower left to middle ...

Ribbons on Mars

A piece of Mars: Bet you didn't know there were ribbons on Mars. Long, sweeping, velvety lines, delicately frayed at the ends. These are actually ancient ripples, formed by a wind blowing from right to left. Stripes on the ripples ...

Lighting effects

A piece of Mars: It's winter in the southern hemisphere, and dunes like these are covered in bright white CO2 frost. The sun is near the horizon (shining from the top of the image), so it creates stark shadows. That ...

There’s ripples and then there’s ripples

A piece of Mars: On the floor of a crater in the southern midlatitudes, there's a field of ripples. But wait, there are big ones that are very sinuous and small ones that are not. Why? Both are ripples, but ...

Yes, this is a bit of windy Mars. Really.

A piece of Mars: Yep, this is really Mars. It's a tiny bit (600x450 m) of the southwestern side of a large dune in the southern midlatitudes. The dark lines are furrows that are thought to be carved by blocks ...

Ancient and slightly less ancient

A piece of Mars: Here are two craters, each of which is ~240 m across. On the right is an old, very eroded crater. It has old, eroded ripples on its floor. The crater on the left is younger, with ...

Little dunes that Curiosity saw last October

A piece of Mars: On Oct. 15, 2013, Curiosity drove past a crater that has small dunes or ripples on its floor. In a new HiRISE image, you can see Curiosity's tracks from that day (its 424th sol on Mars). ...

Mars’ fleets of rock “boats”

A piece of Mars: Where the wind blows strong and there's a lot of sand, the surface gets scoured. Some bits of the ground, called yardangs, are more resistant and stick around: they take on shapes elongated in the direction ...