Gaia, Europe’s Milky Way–mapping spacecraft, shut down earlier this year. It was arguably the most important—and most ...

Scientists at Rice University believe there’s a 40% chance that a mysterious ninth planet — Planet Nine — could be orbiting far beyond Neptune and Pluto in the icy Kuiper Belt. This potential ...

The James Webb Space Telescope's Mid-Infrared Instrument (MIRI) captured imagery of a pair of stars called Wolf-Rayet 140. "Shells of cosmic dust created by the interaction of binary stars appear like ...