New evidence suggests that a comet explosion over North America may have triggered a massive wave of destruction nearly ...

For more than a century, astronomers have known that some “new stars” flaring into view are not births at all but violent ...

Cosmic “touchdown airbursts” — explosions of comets or asteroids above Earth’s surface — may be far more common and ...

A nuclear winter is a theoretical concept, but if the climate scenario expected to follow a large-scale nuclear war, in which smoke and soot from firestorms block sunlight, came to fruition, global ...

Scientists have detected the most distant supernova ever seen, exploding when the universe was less than a billion years old.