A new Hubble Space Telescope image shows a galaxy with a complex identity.
A local star is the most massive ever detected.
Scientists are charting new asteroid territory in order to understand the early Solar System.
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.
NASA's Solar Dynamics Observatory is the most advanced solar imager ever built.
Satellites go wide, then zoom in on galactic dust.
Zoom from the Himalayas to the edge of the observable Universe—and back again.