Tonga Eruption Made Waves in Earth’s Ionosphere

Uranus by 2049: Here's why scientists want NASA to send a flagship mission to the strange planet

50 years ago, Apollo 16 astronauts Charlie Duke and John Young roved across the lunar highlands to study the Moon's geology. Here are the highlights of the mission in the astronauts' own words.

New Zealand's Ruapehu Starting to Show Signs of Potential Eruption