A fusion reactor could pave the way for massive generation of clean energy. ... Voyager found a mystery on Uranus. Decades later, NASA solved it. Progressives begin search for a new leader.

Voyager 1 relays messages to NASA’s mission control team after losing contact due to a technical issue. The aging spacecraft is relying on an old radio transmitter.

HELSINKI — A Chinese nuclear reactor for providing power and propulsion in outer space has passed a comprehensive performance evaluation, according to reports. The reactor was designed by the ...