While nuclear reactors have been around on Earth for over 70 years, placing them on the moon would be unprecedented. NASA’s acting administrator, Sean Duffy, is aiming to do the undone: a reactor ...

Avi Loeb suggested that NASA may have rushed to conclusions by ruling out the possibility of an artificial aircraft.

The Hubble Space Telescope has captured the best picture yet of a high-speed comet visiting our solar system from another ...

A solar storm is forecast for Aug. 7 and 8, creating favorable conditions for the northern lights. Here's where the northern lights may be visible.

Perseids leave long wakes of light and color behind them as they streak through Earth's atmosphere. Here's how to catch a ...