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

A surprising discovery at the heart of the Milky Way is forcing scientists to rethink how massive structures called Fermi ...

Earth and the entire Milky Way galaxy might be sitting inside an enormous, mysterious void—a giant cosmic hole making our universe expand faster right here than anywhere else. This unusual idea, ...

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