A rock collected by the Apollo 17 mission in 1972 yields a surprise.
The Swift satellite, NASA's high-energy detector, is studying black hole mysteries.
In a nebula packed with stars, not all stay with the crowd.
Asteroids may have delivered water to early Earth.
State-of-the-art spacecraft observes our Sun with unprecedented detail.
Satellites go wide, then zoom in on galactic dust.
Zoom from the Himalayas to the edge of the observable Universe—and back again.
Ancient quartz crystals reveal our young planet's magnetic field.
Astronomers get a fresh perspective on the Orion Nebula.
What's stretching space at an ever-faster pace?