NASA has posted an image of its new solar-electric propulsion thruster, which uses xenon ions for propulsion. The engine in the photo, blue with the glow of xenon gas, is

NASA’s Mars rover was on its final approach to the red planet on Sunday, heading toward a mountain that may hold clues about whether life has ever existed on Mars,

While long anticipated in both science and science fiction, the existence of a circumbinary planet — a planet orbiting two stars — like “Tatooine” portrayed in the film Star Wars