Category: HiRISE images

These are blog posts showing my daily image of Mars, which is usually a small piece of a HiRISE image. It includes some text describing the image, and it was also posted on Twitter, Facebook, and Pinterest.

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: ...

Dunes fighting for survival

A Piece of Mars: Having a bad day? You're in good company with these dunes in this 0.96x0.48 km (0.6x0.3 mi) scene. The gray barchanoid dunes are covered in ripples, as the wind valiantly tries to push the sand to ...

Sand tails

A Piece of Mars: Up on the tallest volcanoes, the wind screams downhill at night. This 500x500m (0.31x0.31 mi) scene shows how dust is carried downhill, but only that which is trapped behind boulders and crater rims sticks around. The ...

Curiosity, recovering from the Bagnold dunes campaign

A Piece of Mars: You'll probably want to click on this image to see the whole thing, it's pretty big, and it's worth seeing. This 850x550 m (0.53x0.34 mi) scene shows the barchanoid dunes of the Bagnold dune field, imperceptibly ...

The bowl of windstuff

A Piece of Mars: Get out your red and cyan glasses to see an old crater, which fills this 0.775x0.7 km (0.48x0.43 mi) scene. The crater punched through many thin layers when it formed, some of which you can still ...

A change of fluids

A Piece of Mars: Water carved this ~800 m (0.5 mi) wide channel billions of years ago. The water dried up, and since then it's been sand that flows through here (from the right), building up lovely dunes. A single ...

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 ...

A big rock in a big air stream

A Piece of Mars: Sand pours in from the top of this 1.95x1.95 km (1.21x1.21 mi) scene. The sand piles up and up (here ~115 m or 377 ft high), but ahead (at the bottom) is a mountain poking up. ...

More Earth-like views of Mars

A Piece of Mars: In a recent post (Dunes in a Colorful Hole), I showed some dunes crawling over layered terrain, with a view that looked a lot like some desert regions of Earth. Here's another spot on Mars (0.95x1.1 ...

Windblown or not? Probably…

A Piece of Mars: This 0.95x0.95 km (0.59x0.59 mi) scene shows an eroding surface punctured by some old craters. Long, thin lines seem to form in the wake of many brighter knobs. Are those thin lines windblown in origin? They ...