Astronomers propose a new theory to explain Saturn's unusual rings.
A huge galactic smash-up may have formed the galaxies nearest us.
Astronomers say a black hole recently formed in a nearby galaxy.
A NASA lunar probe reveals that the Moon stores more ice at its poles than previously thought.
Scientists are reproducing supernova explosions on computer screens.
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.