First observation of gravitational waves
Gravitational waves were not predicted to be observable — until they were, and in doing so, they rewrote how we test Einstein’s theory.
Black holes
Where the equations stop returning answers.
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Hawking radiation
Stephen Hawking's 1974 calculation showed black holes should slowly radiate and eventually evaporate, a result with no direct astronomical confirmation yet, that also produced a genuine, still unresolved puzzle about where the information inside them goes.
J. Robert Oppenheimer
Oppenheimer didn’t build bombs — he built the mathematical scaffolding for quantum chemistry, nuclear physics, and black holes.
Roger Penrose
Penrose didn’t find black holes—he proved they’re unavoidable if Einstein was right.
Stephen Hawking
Hawking didn’t prove black holes radiate—he proved they must, if quantum theory and gravity coexist at all.
Event Horizon Telescope
In 2019 the Event Horizon Telescope turned eight radio observatories into one Earth-sized instrument and released a picture of the shadow cast by the black hole at the centre of the galaxy M87.
Holographic principle
A puzzle about black hole entropy scaling with surface area, not volume, led to the idea that a region of space might be fully described by information on its boundary, and Juan Maldacena's 1997 conjecture gave that idea its clearest, still unproven, form.