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Mars Curiosity rover took a panorama of this rock cliff during its trip across Mount Sharp on Mars. Circled is the location of a so-called
Mars Curiosity rover took a panorama of this rock cliff during its trip across Mount Sharp on Mars. Circled is the location of a so-called “doorway on Mars.” Courtesy NASA/JPL/Mars Curiosity team.

Remember all the fuss about the “doorway on Mars” from just last week? Well, this week, NASA issued some more information about the rock mound where the Curiosity rover snapped a pic showing a fracture hole in the rock. It looks like a door, but it’s not.

This discovery came as Curiosity was investigating an area on Mount Sharp for clues to the existence of water early in Martian history. It turns out this odd-shaped opening isn’t much bigger than a dog door here on Earth. Does that mean Mars is occupied by canines that can squeeze through openings 30 by 40 centimeters (12 x 16 inches)? Wouldn’t that be cool? But no, it’s not. But, that knowledge is not enough to keep the “Mars aliens” enthusiasts from promoting their favorite ideas about ancient civilizations on the Red Planet.

Debunking the Doorway on Mars Idea

In last week’s article about Curiosity’s find, we pointed out that this hole in the rocks isn’t a mysterious opening to a subterranean world on Mars. Instead, it turns out to be one of many little naturally occurring rock fractures that are pretty common on the planet. We even see similar types of fractures here on Earth.

As you can see from the main panorama posted from the rover and the Earth sandstone in the scene below, the break in the rocks is fairly typical of sandstones and bedrock. If you look closely, you can see individual layers in the rocks. The scene is pretty familiar to anyone who’s hiked in desert regions and seen desiccated sandstones or along the Front Range of the Rocky Mountains and seen layers of sandstone near the mountains. In the case of the Rockies, sandstone layers got fractured and upended when the central part of the mountain range jutted out to form the Continental Divide. For millions of years before that, the region was covered by an ancient ocean. The sea bottom and shorelines were layered in fine sands, which hardened to become rock.

A view of a fractured sandstone formation on Earth. This type of rock can shatter easily under erosion or other forces. The concentric circles etched on the rock are
A view of a fractured sandstone formation on Earth. This type of rock can shatter easily under erosion or other forces. The concentric circles etched on the rock are “plumose” (plume-like) structures that formed when the rock fractured. Courtesy AWickert. CC BY-SA 3.0.

We see similar rocks in various locations on Earth where lakes, oceans, and riverbeds have deposited layers of sand. It even happens as a result of wind-driven sand and dust. That action creates sand layers and dunes that eventually harden into rock. So, it’s no surprise to see similar features on Mars, given what we know about its surface. And, as on Earth, sandstone on Mars can erode and break pretty easily.

The existence of the shattered rock cliff region where Curiosity is exploring comes as no surprise. And, we shouldn’t be surprised to see fracture “holes” where bits and pieces of rock have broken away over time. The
Did you miss our previous article…
https://www.mansbrand.com/thanks-to-gaia-astronomers-are-able-to-map-out-nebulae-in-3d/

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