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

A comet blazing toward Earth could outshine the full moon when it passes by at the end of next year – if it survives its close encounter with the sun.

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