Tag Archives: ripples

Remnants of erosion

A Piece of Mars: The gray area in the center of the 480x270 m (0.3x0.17 mi) area is an erosional remnant: once, more of this area was covered by the gray stuff, but some of it has eroded away (most ...

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 ...

Too steep for ripples

A piece of Mars: This 480x270 m (0.3x0.17 mi) area is a steep slope that plunges down to the upper left. A pile of dark sand, covered by brighter tan dust, clings to the hillside. Usually the martian wind ...

Windy windows

A Piece of Mars: This 0.96x0.54 km (0.6x0.33 mi) area shows ripples forming on a layer of dark gray material. In a few spots, the gray layer has been eroded away (probably by wind scour), revealing the lighter, tan-colored ...

Crochet ripples

A Piece of Mars: This 480x270 m (1575x886 ft) area shows a seemingly endless field of ripples. They're big, about 50 m (164 ft) from crest to crest, and probably about 5 m (16 ft) high. Is there a ...

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 ...

Is it windblown or not?

A Piece of Mars: This scene is 0.96x0.54 km (0.60x0.34 mi) across. There's an old river valley running across it. The walls of the valley have been eroded and there's a washboard pattern with a wavelength of ~6m (20 ft). ...

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. ...

Sand sheets and ripples

A piece of Mars: Not all sand piles up into big dunes. If the grains are the wrong grain size (too fine or too coarse), then it might just form sand sheets with ripples on top, like it does here, ...