The Giant Magellan Telescope project just cast its seventh and final primary mirror segment, a huge milestone that keeps the scope on target to begin operations in the late 2020s.

On Wednesday (Sept. 27), China launched a fourth satellite in the Yaogan 33 group, which are believed to be radar reconnaissance craft.

China's Shenzhou 16 astronauts conducted an eye-raising experiment in space involving open flames aboard the Tiangong space station.

The exoplanet K2-18b might host a water ocean.

Self-sustaining chemical reactions that could support biology radically different from life as we know it might exist on many different planets, a new study finds.

A European collaboration aims to break through some of the technological barriers to the exploration of icy moons like Jupiter's Europa, using Antarctica as a proving ground.

The seventh episode of Ahsoka sets up a race against time for the season finale and mostly plays out like a classic Star Wars Rebels episode.