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 ...

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 ...

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

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