Astronomy

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

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.

After a surprise discovery, astrophysicists are racing to understand superenergetic flashes of radio waves that sometimes beep out from distant galaxies.

The first star map from the ESA’s Gaia space telescope is poised to revolutionize our understanding of the Milky Way galaxy.

How do scientists react to major breaking science news? For astrophysicists after the big gravitational waves announcement, it was meeting for two weeks in Santa Barbara, California.

Just months after their discovery, gravitational waves coming from the mergers of black holes are shaking up astrophysics.

The spokesperson for the Laser Interferometer Gravitational-Wave Observatory called it “a promising start to mapping the populations of black holes in our universe.”