Tag Archives: complex wind

Mars’ corduory

A Piece of Mars: The wind on Mars likes to make textiles (unfortunately the term geotextiles is already taken for other purposes). This 1x0.6 km (0.62x0.37 mi) scene shows two different sets of ripples. The larger set has straight to ...

The crazy laciness of martian TARs

A Piece of Mars: Take a look at the windblown stuff in this 0.55x0.625 km (0.34x0.39 mi) scene. Those are intricate patterns of a sort of dune-ripple thing that forms all over on Mars, but not so much on Earth. ...

Wind and maybe water too

A Piece of Mars: Along the right side of this 0.5x0.5 km (0.31x0.31 mi) scene is the rim of a crater - the stripes are layers exposed (and then perhaps draped by falling ejecta) as the crater formed. To the ...

The real tetrahedrons of Mars

A Piece of Mars: The real tetrahedrons of Mars are dunes, built by winds blowing sand from more than one direction. This 0.5x0.5 km (0.31x0.31 mi) area shows a dune formed from two winds that are about 90 degrees apart: ...

Two directions

A Piece of Mars: Sometimes I just want to show the interior of a dune field, because it's full of waves: ripples and dune crests, slip faces, all of which signs of movement. The dunes in this 0.67x0.47 km (0.41x0.29 ...

Mars’ giant sweaters

A Piece of Mars: Sometimes in the floors of small craters, the wind blows in from several directions to produce odd polygon-shaped dunes that look like crochet (maybe Mars is making sweaters for its craters - it is, after all, ...

Giant “combs” on Mars

A Piece of Mars: This 480x270 m (0.3x0.17 mi) scene shows a herd of 100-300 m fine-toothed combs grazing on the surface of Mars. Wait, what? No, it's not really combs. This is actually a landscape covered by two sets ...

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 ...

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 ...

The long, low dune

A piece of Mars: A long, low dune covered in long, linear ripples stretches across the scene (600x450 m; 1969x1476 ft). Dark gray areas on the dune show where sand has most recently moved. A small slip face has formed ...