A meteor exploded over the Bering Sea on December 18, 2018, at 11:48 a.m. local time, with a force equivalent to roughly 173 kilotons of TNT, roughly ten times the energy released by the bomb dropped on Hiroshima in 1945. Although there were no reported witnesses to the meteor’s dramaticread more

The European Space Agency’s (ESA) Mars Express orbiter has uncovered signs that Mars once had a vast network of waterways, including a planet-spanning ocean in its northern hemisphere, and an extensive network of rivers that carved majestic canyons through the ancient Martian landscape. Using its Mars Advanced Radar for Subsurfaceread more