Scientists aren't sure whether humanity really detected moons outside the solar system.

A new theory suggests the universe's most mysterious and dominant form of matter could exert a "dark force."

NASA is licensing a radical new form of propulsion that uses electromagnets to control the flow of plasma over aircraft and spacecraft flying at hypersonic speeds.

A fresh understanding of how black holes eat offers a new way to estimate their masses.

On Friday, Dec. 8, Halley's Comet reaches its farthest point from the sun and begins its journey back through the solar system.

Weird effects of space junk collisions could help researchers detect dangerous, hard-to-see orbital clutter.