Virgin Galactic has launched its first tourist passengers — Olympian Jon Goodwin and mother-daughter duo Keisha Schahaff and Anastatia Mayers — to the edge of space and back. The flight, called ...

At the heart of our galaxy lies a cosmic puzzle: although the Galactic Center is packed with star-making material, massive stars form there surprisingly slowly. Using NASA's retired SOFIA observatory, ...

Science fiction legend Arthur C. Clarke was famous for the axiom that “any sufficiently advanced technology is indistinguishable from magic,” but what his fellow golden-age sci-fi writer Isaac Asimov ...