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.
NASA's newest infrared space telescope is revealing the unseen Universe.
A new Hubble Space Telescope image shows a galaxy with a complex identity.
A local star is the most massive ever detected.
Scientists chart new asteroid territory in order to understand the early Solar System.
A rock collected by the Apollo 17 mission in 1972 yields a surprise.