Astronomers have observed a binary star system orbiting near the supermassive black hole at the center of the Milky Way galaxy. The discovery of Sagittarius A* (Sgr A*), published Tuesday in ...

At about 2.7 million years old, the twin stars seem to be fairly young. Scientists said they appear to orbit each other at just the right distance: If they were too spread out, the black hole's ...

The Sun may have once had a twin star named Nemesis ... left in the vast emptiness of space. Advances in astronomy offer hope of finding this elusive sibling and confirming its existence.