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The newly developed theory of emergent gravity, proposed as an alternative to dark matter, struggles in one of its first trials.
Recent calculations tie together two conjectures about gravity, potentially revealing new truths about its elusive quantum nature.
The physicist who designed the LIGO experiment that detected gravitational waves still holes up in a small basement lab surrounded by electronics and optical instruments.
A satellite spotted a burst of light just as gravitational waves rolled in from the collision of two black holes. Was the flash a cosmic coincidence, or do astrophysicists need to rethink what black holes can do?
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