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Sometimes a mirror that reflects 99.9999% of light isn’t good enough.
A recent neutron star merger has defied astronomers’ expectations, leading them to question longstanding ideas about neutron stars and the supernovas that create them. “We have to go back to the drawing board.”
At stake are fundamental ideas about how black holes form — and a six-way bet.
Two independent papers vanquish lingering doubts about LIGO’s historic discovery of gravitational waves.
Mathematicians have disproved the strong cosmic censorship conjecture. Their work answers one of the most important questions in the study of general relativity and changes the way we think about space-time.
New observations of extreme astrophysical systems have “brutally and pitilessly murdered” attempts to replace Einstein’s general theory of relativity.
Gravitational waves have opened up new ways to test the properties of black holes — and Einstein’s theory of gravity along with them.