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Astronomers have published the largest map yet of the spread of galaxies and bright black holes through space.

The source of cosmic rays, a universe mystery that has long perplexed astronomers, has just gotten stranger. Scientists have nearly ruled out their prime suspect, gamma-ray bursts.

The bus-size asteroid 2012 BX34 will give Earth a close shave Friday. But the space rock won't hit us, experts say. And it may provide advanced amateur astronomers with a skywatching opportunity.

Astronomers using Europe's HARPS telescope have discovered 50 new exoplanets orbiting nearby stars - including these 16 super-Earths, one of which lies withi...

A huge storm on the sun this past week unleashed what some have called the most massive eruption of solar plasma ever seen. NASA astronomers said the huge June 7 solar eruption, called a coronal mass ejection, probably wasn't the...

Astronomers have witnessed a cosmic explosion so strange they don't even know what to call it. Although the blowup, discovered with NASA's Swift

AFTER 10 years of comparative slumber, the sun is waking up - and it's got astronomers on full alert.

AMATEUR astronomers are enjoying a cat-and-mouse game with the US military in keeping track of its secret space plane, the X-37B.