Kruskal–Szekeres coordinates

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In general relativity, Kruskal–Szekeres coordinates, named after Martin Kruskal and George Szekeres, are a coordinate system for the Schwarzschild geometry for a black hole.

Excerpt from the Wikipedia article “Kruskal–Szekeres coordinates”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Dr Greg, CC BY-SA 3.0, via Wikimedia Commons.