New analysis suggests that problems with NASA’s MAVEN Mars orbiter may be more serious than a simple communications glitch.

Astronomers have made an unexpected discovery about the planet TOI-3884b, which orbits its star at a crazy angle. The planet’s orbit is tilted by around 62 degrees compared to the star’s rotation, and ...

China sent a spacecraft carrying three astronauts to its space station for the first in-orbit crew rotation in Chinese space history, launching operation of the second inhabited outpost in low-Earth ...

U.S. and Chinese satellites routinely spy on each other in orbit, rehearsing for more aggressive operations in the event of war.