The NASA gamma-ray spacecraft Fermi may have enabled scientists to "see" dark matter, the universe's most mysterious stuff, for the first time.

Small icy moons in the outer reaches of our solar system may hide boiling oceans underneath their surfaces, a new study finds.

Sen. Mark Kelly (D-Ariz.), a former NASA astronaut, is under investigation for his participation in a short video reminding members of the U.S. military not to obey illegal orders.

NASA's Perseverance rover spotted a possible space rock on the surface of Mars. The meteorite's nickname is 'Phippsaksla.'

High above a storm, a mysterious red ring appeared for a split second. Here's how one photographer captured the elusive "elve."

China's uncrewed Shenzhou 22 spacecraft arrived at the Tiangong space station early Tuesday morning (Nov. 25), giving the three astronauts living there a safe way to get home.