Physics

Breathless media coverage notwithstanding, the cases for and against a hypothetical Planet Nine in the outskirts of the solar system remain inconclusive.

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.

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.

New math shows how, contrary to conventional scientific wisdom, conscious beings and other macroscopic entities might have greater influence over the future than do the sum of their microscopic components.

The Advanced Laser Interferometer Gravitational-Wave Observatory’s third detection further compounds the mystery of why black holes collide.

Join David Kaplan on a virtual-reality tour showing how the sun, the Earth and the other planets came to be.

A series of observations at the very edge of the universe has reignited a debate over what lifted the primordial cosmic fog.