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.

Dust trapped on the lee side

A Piece of Mars: This 0.95x1 km (.59x.62 mi) scene shows the center of a small dune field. The dunes are shaped by three winds blowing from three different directions: from the west-southwest, east, and south. The north-facing slopes are ...

Leeward and poleward

A Piece of Mars: The sharp line in this 0.625x0.625 km (0.39x0.39 mi) scene is the crest of a long dune in Mars' southern hemisphere. The sunlit side is also the lee side: the bright streaks are thin sand avalanches ...

Endless wind

A Piece of Mars: This 2.88x1.13 km (1.79x0.70 mi) scene shows quintessential Mars, with a 670 m diameter impact crater heavily modified by wind erosion. Both the crater floor and the surrounding terrain are covered by what is likely loosely-cemented ...

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 ...

Exhumed dunes!

A Piece of Mars: The large dunes in the middle of this 375x450 m (0.23x0.28 mi) scene run along a valley (the small dunes at top and bottom are on high ground). What's amazing about this is that the ends ...

Mars’ giant bubble wrap

A Piece of Mars: This 0.7x0.5 km (0.43x.31 mi) scene shows Mars' giant yellow bubble wrap, with each "bubble" about 100 m across (seriously, don't you want to pop them?). These are actually a type of dune called a "dome ...

Cross-strata or not?

A Piece of Mars: Sand dunes are one of the few sedimentary phenomena that leave behind layers that aren't horizontal. They tend to have a characteristic lean to them (and we call them cross-strata). So when I see something that ...

Westward moving

A Piece of Mars: No great scientific insights today, just a really lovely view of bright TARs and some very dark sand in this 0.875x0.5 km (0.54x0.31 mi) scene. Only one major wind acts in this region, moving sediment toward ...

Experimenting with 3D views

A Piece of Mars: I often use JMARS to visualize Mars data sets, especially images. They've recently updated their 3D layer, allowing folks to make lovely vistas by overlaying DTMs with images. I'm new at this, but I'll experiment and ...

Reversing slip faces

A Piece of Mars: This 523x750 m (0.32x0.47 mi) scene shows a large dune. It's quite colorful for some reason, although it's partially false-color. What caught my eye is that the slip face on this dune has reversed direction, which ...