Tag Archives: dunes

Itty bitty changes: places where the wind barely moves sand

A Piece of Mars: Not all dunes on Mars are moving at a measurable pace. This 0.96x0.45 km (0.6x0.28 mi) scene looks a lot like one I posted 3 years ago called Martian Sports. This image shows the same dunes ...

Wind shadow

A Piece of Mars: There's a dune field migrating past a 230 m (755 ft) diameter crater, creating a 1.6 km (1 mi) long "shadow" that's empty of dunes. Why? The rim of the crater pokes up just enough to ...

Three types of windblown piles of stuff

A Piece of Mars: The wind blows different sorts of sediment in different ways. Ultimately they pile up because some oddity in nature makes one spot accumulate more sediment than other spots, allowing that windblown pile of stuff to grow. ...

Dune shadows

A Piece of Mars: Normally I post in color, but sometimes you need to back out to the grayscale images to see the big awesome things. This scene is 4.6x2.6 km (2.8x1.6 mi); the conical hill is 1.4 km (0.89 ...

Springtime for sand dunes and polar ice

A Piece of Mars: This 480x270 m (0.3x0.17 mi) scene shows a dark dune peeking out from under its cover of winter frost. In this picture it's late spring, but still cold up at this latitude - it's as far ...

Curiosity about sand dunes (part 2/2)

Today is December 21, 2015 (northern winter and southern summer solstice on Earth). On Mars it is Ls = 84ยบ, Mars Year 33 (about 12 sols from northern summer and southern winter solstice on Mars). It is sol 1200 of ...

Curiosity about sand dunes (part 1/2)

Sorry for the pun in the title there, but NASA asked for it by naming their rover like that. And you've seen it done a hundred times, so let's grit our teeth, smile, and carry on. Anyway. So I'm more excited now ...

Very long ripples

A Piece of Mars: Most of the scene (0.96x0.54 km or 0.6x0.34 mi) is one long slope of a dune. The crest is the line in the top right; the ground below is in the bottom left. If you ...

Peas in a pod

A Piece of Mars: These "peas-in-a-pod" are dunes covered in long ripples (the scene is 960x480 m, or 0.6x0.3 mi). They're a bit odd, surrounded by a rippled apron. It reminds me of melted-looking dunes that are common in ...

Dune trails

A Piece of Mars: The dark dunes in this 0.96x0.54 km (0.60x0.34 mi) scene are slowly migrating towards the lower left. Look closer and you'll see brighter ripples between the dunes - the biggest ones are ~8m (26 ft) apart. ...