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New Views of Ancient Martian Landscapes

Posted By Bill Dunford

08-12-2014 11:21 CST

Topics: pretty pictures, Mars, Mars Reconnaissance Orbiter

One of the national treasures of the United States comes from somewhere very far from the country's shores, and it's available not just to Americans, but to anyone on Earth. A sharp-eyed camera called HiRISE continuously circles Mars aboard the Mars Reconnaissance Orbiter. The archive of high-resolution data products sent home from HiRISE now includes 3,952,550 items--some 125 terabytes of information. In December alone, the HiRISE team at the University of Arizona added 42,985 products to the Planetary Data System, the official repository of scientific data from NASA planetary missions. 

That trove includes thousands of pictures that reveal the face of Mars at a level of detail never seen before, with some images so sharp that if a person were standing on the surface of the planet you could see them waving. The landscapes are sometimes Earth-like, sometimes alien, often weird, and always wonderful.

Looking through the latest batch turns up some beauties. Here are just few. All of these were taken just a couple of months ago. 

This crater in the southern highlands of Mars contains a lovely lattice of polygonal shapes, likely caused by ice near or below the surface. 

Polygons in a Martian Impact Crater

NASA / JPL / University of Arizona

Polygons in a Martian Impact Crater
The HiRISE camera on board the Mars Reconnaissance Orbiter captured this view of a crater in the southern hemisphere of Mars in October of 2014. The contrast in this image has been increased slightly from the original.

One of the most intriguing kinds of features on Mars are the alcoves and gullies that form on some crater walls. Some Mars explorers speculate that liquid water seeping between layers of rock could play a role in their creation.

Gully in a Martian Crater

NASA / JPL / University of Arizona

Gully in a Martian Crater

It's a beautiful and compelling scene at this scale, but HiRISE can actually provide much closer views than this. Let's zoom in on this one, close enough to see individual boulders, close enough maybe to make geologists want to reach for a shovel. 

Crater Gully

NASA / JPL / University of Arizona

Crater Gully
A gully in a crater wall in Mars' southern highlands, as observed by the HiRISE camera on board the Mars Reconnaissance Orbiter in October 2014. The gully alcove is a few hundred meters wide.

Here's an odd one: amid the smooth, young lava flows of Athabasca, a circular feature a couple of kilometers across disrupts the rock. Perhaps lava beneath the mound pushed it up above the plain. See more

Intriguing Feature in Athabasca

NASA / JPL / University of Arizona

Intriguing Feature in Athabasca
The Mars Reconnaissance Orbiter spied this unusual feature in the lava flows in the Athabasca region of Mars. It's about 2 kilometers wide.

All the way down near the planet's south pole, on the great carbon dioxide ice cap, is a good place to look for some of Mars' most alien scenes. As the ice sublimates during the warmer months, sometimes bare patches of ground get exposed, and in some places geysers of material actually blast up from underneath the warming ice sheet. The wind then creates its own artwork as it blows material across the ground. In other places, the disappearing ice leaves behind bizarre fingerprint-shaped depressions several meters deep. 

Martian Fans

NASA / JPL / University of Arizona

Martian Fans
The HiRISE camera on board the Mars Reconnaissance Orbiter captured this look at the spectacular patterns created by wind-blown material on the south polar ice cap of Mars. The area shown is about a kilometer across.
Mars South Polar Ice Cap Formations

NASA / JPL / University of Arizona

Mars South Polar Ice Cap Formations
Places on the south polar cap of Mars where carbon dioxide ice has sublimated away, as seen by the HiRISE camera on board the Mars Reconnaissance Orbiter. The area shown is about a kilometer across.

This is only the tiniest sampling of the pictures in the latest release. To explore others on your own, see the HiRISE site.

See other posts from December 2014


Read more blog entries about: pretty pictures, Mars, Mars Reconnaissance Orbiter


merc: 12/08/2014 03:14 CST

On the last image, I can't tell if the formations are rising up out of the surface or cratering downward. Beautiful images, though!

Billl: 12/08/2014 03:35 CST

Very common issue with that kind of image. The formations are depressions. It might help to point out the sunlight is coming from the upper left.

Sage Geo: 12/08/2014 03:52 CST

The black smudgy features in the Martian Fans photo are reminiscent of the deposits formed on the surface downwind of the south polar Triton geysers. The two may be the result of similar sublimation processes.

Simon_Frazier: 12/08/2014 10:39 CST

I'd suggest the circular landform in Athabaska Vallis might be a pingo - a very large frost heave that produces conical hills in waterlogged soils in permafrost zones. Appropriately enough, there are earthly pingos in the Mackenzie River delta (in Canada's NWT), downstream of the tributary Athabaska River...

Bob Ware: 12/14/2014 09:18 CST

Nice image choices as usual Bill. Thanks! Regarding the Martian fans ... I sure hope that image does not come to me for marking! Wow that looks to have been one good sized sheet of uniform thickness of ice that sublimated quickly on a really windy day!

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