Astronomers observe a rare supernova—the closest to Earth in nearly a century.
The WISE mission catches sight of a faint, elusive type of brown dwarf.
Scientists suspect a distant planet has a magnetic field.
MESSENGER returns the first images from its orbit around Mercury.
A close view of the asteroid Kleopatra and its two moons gives clues to planet formation.
Become a citizen scientist and help measure light pollution in your area.
A NASA X-ray telescope reveals an unusual ring of eight black holes.
Does a shroud of energy from the Big Bang bear scars of other universes?
Astronomers propose a new theory to explain Saturn's unusual rings.
A huge galactic smash-up may have formed the galaxies nearest us.