Black hole

Rarity: Legendary

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Science and technology

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What Wikipedia says

A black hole is an astronomical body so compact that its gravity prevents anything, including light, from escaping. Albert Einstein's theory of general relativity, which describes gravitation as the curvature of spacetime, predicts that any sufficiently compact mass will form a black hole.

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

Image: Event Horizon Telescope, uploader cropped and converted TIF to JPG, CC BY 4.0, via Wikimedia Commons.