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Science
Physicist claims time travel can only take us to the future
A physicist's mathematical proof suggests certain spacetimes fundamentally forbid backward time travel, limiting temporal movement to the future only.
Spacetime
4 trends tracked about this subject — the full history, oldest to newest below.
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Science
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This 'impossible' black hole merger may be explained by a warp in spacetime
Astronomers propose gravitational lensing as a new explanation for an impossible, record-breaking black hole merger.
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Science
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Quantum gravity tests may mistake ordinary spacetime for superposition
New research from Kyushu University suggests that quantum gravity tests may be misinterpreting ordinary spacetime as quantum superposition.
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Science
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A 'direct wave' from colliding black holes reveals signature of a whirlpool in spacetime
Astronomers have utilized the loudest gravitational waves ever recorded to study the event horizon and spacetime whirlpools of colliding black holes.