Scientists predict up to 100 invisible galaxies may orbit the Milky Way, hiding just beyond our current detection limits.

A newly discovered ice comet from deep space may be over 7 billion years old, making it the most ancient comet scientists ...

The Hubble Space Telescope has found evidence of a "wandering" black hole about 5000 light years away in the Milky Way galaxy ...

Astronomers have discovered a giant, 500-light-year-wide cavity between two star-forming regions in the constellations ...

New supercomputer simulations suggest the Milky Way could be surrounded by dozens more faint, undetected satellite ...

Professor Avi Loeb, a theoretical physicist and cosmologist from Harvard University, told MailOnline why he thinks a new ...

A newly discovered object from deep space may be the oldest comet ever observed—possibly more than 7 billion years old, and ...