About this raw image (https://t.co/hZxiepGQXx), what’s that? An entrance to a secret underground tunnel? Watching it in context as part of the whole mosaic, we can see that little niche in a rock w/ other blocks, fractures, shapes & other erosive features all over that rock face. pic.twitter.com/ou4Ze941HR
“It’s just the space between two fractures in a rock,” Ashwin Vasavada, a project scientist in the Mars Science Laboratory, said, according to Gizmodo.
“We’ve been traversing through an area that has formed from ancient sand dunes.”
Over time, the sand dunes melded while pressure caused fractures in the terrain.
These sand dunes were cemented together over time, creating the sandstone outcrops Curiosity is passing by.
“The fractures we see in this area are generally vertical,” Vasavada said.
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“I think what we have here [is] either two vertical fractures, where the middle piece has been removed, or one vertical fracture, and the blocks have moved apart a little bit.”
“The mound, on Mount Sharp, has a number of naturally occurring open fractures – including one roughly 12 inches (30 centimeters) tall and 16 inches (40 centimeters) wide, similar in size to a dog door,” according to a statement from NASA.
“These kinds of open fractures are common in bedrock, both on Earth and on Mars.”
NASA’s Curiosity team posted more on Twitter.
Here’s a zoomed-out view with the feature circled. In it, you see a small crevice (>30 cm tall) between 2 fractures in a rock. There are several linear fractures in the mound – but in this spot, several fractures intersect, which allowed the rock to break at such sharp angles. pic.twitter.com/0yHEy1wIfi
In a less literal sense, my science team is interested in these rocks as a “door” to the ancient past. As I climb up this mountain, I’m seeing higher levels of clay give way to salty minerals called sulfates – clues as to how water dried up on Mars billions of years ago.
Curiosity has been driving around Mars since 2012, which amounts to about 3,500 days on the Martian surface, according to NASA. In that time, the rover has sent back over 900,000 images.