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I'm sheepishly admitting that at first glance I thought I was looking at a picture of some sort of sea creature. However it is, in fact, Hebes Chasma on Mars. It's an enclosed trough with a flat-topped mesa in the center. "It's nearly 8 km deep and stretches "315 km in an east–west direction and 125 km from north to south at its widest point."

It's a mosaic made up of eight single images that were taken with the High Resolution Stereo Camera on ESA's Mars Express orbiter.

Credit: ESA/DLR/FU Berlin (G. Neukum), CC BY-SA 3.0 IGO

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Looks like crystals.

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Fascinating!

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Here's an image that looks as though it could have been taken on Earth. But NASA's Curiosity rover took it on Mars in 2014.
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It shows a pattern typical of a lake-floor sedimentary deposit near where flowing water entered a lake. Shallow and deep parts of an ancient Martian lake left different clues in mudstone formed from lakebed deposits.

Credits: NASA/JPL-Caltech/MSSS

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It is like this was taken on Earth!

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What created this unusual hole in Mars/, Astronomy Picture of the Day asks.
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A leading hypothesis is that it was created by a meteor impact. Holes such as this are of particular interest because they might be portals to lower levels that extend into expansive underground caves. If so, these naturally-occurring tunnels are relatively protected from the harsh surface of Mars, making them relatively good candidates to contain Martian life. These pits are therefore prime targets for possible future spacecraft, robots, and even human interplanetary explorers.


Image Credit: NASA, MRO, HiRISE, JPL, U. Arizona

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Here is a splendid picture of Vera Rubin ridge on Mars. Breathtaking panorama and if you click to enlarge, amazing detail. It's hard to believe that it's another world.

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Looks like our desert.

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NASA's Curiosity Mars rover examined a mudstone outcrop area called 'Pahrump Hills' on lower Mount Sharp, in 2014 and 2015. Blue dots indicate where drilled samples of powdered rock were collected for analysis.

Scientists learned a good deal about past Martian environments here. For example, in the "Confidence Hills" and "Mojave 2" samples, they found clay minerals. These generally form in the presence of liquid water with a near-neutral pH, and therefore suggest past environments that were conducive to life. However the other mineral discovered here was jarosite, a salt that forms in acidic solutions. The jarosite indicates that there were acidic fluids at some point in time in this region.

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One of Curiosity's navcams took the picture of Curiosity Leaving Tracks in the Martian Sand. The rover is headed back to the path leading to the Vera Rubin Ridge access ramp. Each wheel track is 40 cm wide.

Credit: NASA/JPL-CalTech

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