One of the strangest galaxies in the neighborhood of the Milky Way has just presented astronomers with a fascinating mystery.

As many as 400 volcanoes are erupting on the surface of Jupiter's innermost moon Io, with virtually every square inch of the ...

A long-standing mystery about a strange cluster of stars in our galaxy may have finally been solved by scientists. The stars at the center of this huge cluster, Omega Centauri, appear to be moving ...