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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.
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.
Does the force of gravity change at large scales? Perhaps not, but a new theory of dark matter shows why that could appear to be the case.
A different kind of dark matter could help to resolve an old celestial conundrum.
The Advanced Laser Interferometer Gravitational-Wave Observatory’s third detection further compounds the mystery of why black holes collide.
A series of observations at the very edge of the universe has reignited a debate over what lifted the primordial cosmic fog.
Angela Olinto’s new balloon experiment takes her one step closer to the unknown source of the most energetic particles in the universe.
After a surprise discovery, astrophysicists are racing to understand superenergetic flashes of radio waves that sometimes beep out from distant galaxies.
For decades, researchers believed that violent supernovas forged gold and other heavy elements. But many now argue for a different cosmic quarry.