Although it won’t hit Earth, an asteroid once labeled a “city killer” is now back in the spotlight — this time, because it ...

When a six-mile-wide asteroid slammed into Earth 66 million years ago, it didn’t just wipe out the dinosaurs. New findings ...

A comet that was born in another solar system and could be billions of years old is hurdling through Earth’s solar system — a ...

Scientists warn the universe could reverse its expansion and collapse in a “Big Crunch” — with the first signs possibly emerging in just 10 billion years.