Nell Greenfieldboyce - NPR
NASA successfully crashed a spacecraft into an asteroid in a test of planetary defense. Now it will determine whether the mission was able to alter the asteroid's course.
Picture perfect: Mission managers say the telescope's mirror segments have been aligned and have focused on single stars, a critical milestone, and the telescope is working flawlessly.
NASA's TESS telescope finds a small, iron-rich planet which could help explain the origins of Mercury, the innermost planet in our solar system
NASA is about to launch the first mission of its new planetary defense office. A spacecraft will attempt to knock a small asteroid off course by ramming into it.
Scientists have gotten the best estimates yet of exactly how much baleen whales, the largest animals on the planet, can consume in one day. Their caloric intake is mind-boggling.