All things that go up must eventually come down. NASA says that its Van Allen Probe A satellite has fallen precipitously back to Earth after a 14-year journey through space. The probe reentered the ...

Astronomers have caught what may be a rare cosmic catastrophe unfolding 11,000 light-years away. A seemingly ordinary sun-like star suddenly began flickering wildly, puzzling scientists until they ...

The comet formed in a cold and distant part of the early Milky Way up to 12 billion years ago, putting it just under 2 billion years the age of the universe.