NASA’s Curiosity Rover Spotted a ‘Doorway’ on Mars | TechBuzz

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Image from NASA's Curiosity rover showing what looks like a doorway on Mars.

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NASA’s Curiosity rover took a photo of a Lovecraftian feature on the surface of Mars last week: a seemingly rectangular and shadowy opening in the planet’s exposed rock that looks as if it leads into the Martian underground.

The image was captured on May 7 by the Curiosity rover’s Mastcam while it ascended Mount Sharp. While the grainy black-and-white image may have conspiracy theorists over the moon, it almost definitely doesn’t show the entrance to an underground alien society.

“It’s just the space between two fractures in a rock,” Ashwin Vasavada told Gizmodo in a phone call today. Vasavada is a project scientist in the Mars Science Laboratory, and he said the formation is definitely not the entrance to a video game’s dungeon level. “We’ve been traversing through an area that has formed from ancient sand dunes,” he said. These sand dunes were cemented together over time, creating the sandstone outcrops Curiosity is passing by.

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Vasavada told us that the fracture is only about a foot tall and that, once these sand dunes were compacted together, they were buried and unburied over time as the sand on Mars’ surface shifted. During this process, the sandstone was under varying pressure, causing it to buckle and fracture in different places. “The fractures we see in this area are generally vertical,” he explained. This particular doorway-shaped fracture likely formed in one of two ways.

“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,” Vasavada said.

The Curiosity rover has been trawling around Mars since it landed in August 2012 in Gale Crater. The rover has since covered 17.3 miles (27.84 kilometers) in 3,472 Martian days, or ‘sols’. When Curiosity isn’t collecting rock and soil samples, it’s taking photos using its panoramic Mastcam (mast + camera).

This photo from Curiosity is another example of our tendency to see familiar forms in an unfamiliar landscape. In the past, people have thought they’ve seen all kinds of out-of-place things on Mars, including a squirrel and spoon.

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