July 14 (UPI) -- The Axiom-4 space crew undocked from the International Space Station on Monday morning as it prepares to ...

Astronomers now think Earth and our Milky Way galaxy might be sitting in a giant, mysterious “cosmic void”—a huge region of ...

Our Milky Way could have many more satellite galaxies than we've detected so far. They're just too faint to be seen.

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 ...