Tenets of quantum mechanics and special relativity, among other theoretical ideas, lead inexorably to string theory.
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Faint black hole 'ringing' provides a sharper test of Einstein’s gravity
When two black holes crash together, the violence does not end at impact. The newly formed black hole keeps shaking, shedding energy as gravitational waves while it settles down. Physicists call that ...
Time after the Big Bang may have behaved differently as extreme gravity warped spacetime across the early Universe.
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