spacetime

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• Gravitational Waves: Ripples in Spacetime Explained
  Gravitational waves are ripples in spacetime from accelerating masses. LIGO first detected them in 2015 from two merging black holes 1.3 billion light-years away.
• Black Holes
  Regions of spacetime where gravity is so strong that nothing, not even light, can escape from inside the event horizon.
• Special Relativity
  Einstein's 1905 theory of space and time, built on the constancy of the speed of light and the equivalence of all inertial frames.