Category: HiRISE images

HiRISE images

Stealth bomber dunes

A piece of Mars: These dunes look strangely triangular, a little bit like a flock of stealth bombers. Why? They're two-faced barchans. Each flat face is an avalanche slope that faces downwind, formed by one of two distinct wind patterns ...

What is burying what?

A piece of Mars: There's an egg-shaped plateau here (the whole scene is 480x270 m or 525x295 yd across, the "egg" is ~100 m long). It's partly covered by dunes that have extended across it. Or were the dunes there ...

Dust devils and wind scours on ripples on dunes

A piece of Mars: So much wind. There are dark swirly tracks of dust devils that have passed by, ripples covering dunes, wind scours around rocks, and of course dunes. Dune crests have a different color than other regions: are ...

Frosty dunes

A piece of Mars: In this image (0.96x0.54 km or 0.6x0.33 mi), it's late winter and the sun is barely above the horizon here near the north pole. The dunes are covered in winter frost, most of which is CO2 ...

Small dunes on Mars

A piece of Mars: These dunes are some of the smallest on Mars. The smallest in this frame is ~150 m long (492 ft). But the smallest Earth dunes are ~20 m across. Why are they so much bigger on ...

The looming dune

A piece of Mars: this 0.96x0.54 km (0.6x0.33 mi) scene shows a large, rippled dune that is slowly marching towards the upper right. The smooth striped band running from upper left to lower right is the slip face, where sand ...

Windblown or not?

A piece of Mars: The surface in this 960x540 m (0.6x0.34 mi) scene has a distinct fabric to it that runs from the upper left to lower right. Are these old lithified dunes? And what makes the tiny filamentary lines ...

Wind stripes

A piece of Mars: Yes, I post a lot of pictures of martian dunes with striped patterns. They're all distinct and beautiful. So here's another one, 480x270 m (0.3x0.17 mi) in size. These beasts moved from right to left across ...

Martian lace

A piece of Mars: This 300x300 m (984x984 ft) scene shows bright windblown dunes or ripples arrayed in a lacy pattern (the biggest ones are about 5 m, or 16 ft, across). This is near the landing site of Ares ...

Flow

A piece of Mars: Below this ~550 m (0.3 mi) wide crater lies a ~1.3 km (0.8 mi) long "beard", the wake of an ancient flow around the crater. Based on its location on Mars, I'm guessing the fluid flowing ...