Mars monolith

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What Wikipedia says

The Mars monolith is a rectangular object, probably a boulder, discovered on the surface of Mars. The Mars Reconnaissance Orbiter took pictures of it from orbit, roughly 180 miles (300 km) away.

Excerpt from the Wikipedia article “Mars monolith”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NASA, Public domain, via Wikimedia Commons.