KS
1916
Schwarzschild solution
First exact solution to Einstein's field equations describing a non-rotating black hole.
Karl Schwarzschild
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Explore / Physics
14,200 explorers / 3 open questions / 847 papers
A black hole is a region of spacetime where matter has collapsed so densely that the escape velocity exceeds the speed of light.
Known nodes connect to ghost nodes where questions remain open.
Credit follows documented contributions. Open questions remain attached to the historical path rather than being presented as context-free prompts.
1916
Schwarzschild solution
First exact solution to Einstein's field equations describing a non-rotating black hole.
Karl Schwarzschild
1974
Hawking radiation
Quantum field theory in curved spacetime suggests black holes radiate thermally.
Stephen Hawking
2019
First image
Humanity captured the first direct image of a black hole shadow in M87.
Event Horizon Telescope
Open questions