Phobos monolith

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Notion

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Science and technology

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What Wikipedia says

The Phobos monolith is a large rock on the surface of Mars's moon Phobos. It is a boulder, about 85 m (279 ft) across and 90 m (300 ft) tall. A monolith is a geological feature consisting of a single massive piece of rock.

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

Image: Mars Global Surveyor, Public domain, via Wikimedia Commons.