NASA could soon be facing an awful choice. The agency, feeling a budgetary squeeze from Congress, might not be able to fund all its robotic planetary exploration missions after next year. This year ...

Dutifully beaming back data to the very end, NASA's long-lived Cassini probe slammed into Saturn's atmosphere at some 77,000 mph Friday, blazing like a shooting star as it was ripped apart and ...

Thirteen years after reaching Saturn, NASA's nuclear-powered Cassini spacecraft raced through its 294th and final orbit Thursday, collecting priceless data while hurtling toward a kamikaze-like plunge ...