They were too big and too far away to exist by the rules. Now, using the James Webb Space Telescope (JWST), an international team of astronomers has finally cracked the chemical code of these distant ...

The Sun is not nailed to the center of the solar system. It moves, wobbles, and traces a small loop through space, tugged by ...

Russia and China can black out military satellites in seconds. A Latvian startup says nuclear-waste generators using 5x less fuel could keep satellites—and lunar bases—running.