When a space rock big enough to end civilization shows up on the radar, the margin for philosophical debate shrinks fast. In ...

If an asteroid is on a collision course with the moon, what should humanity do? Try to nudge the space rock out of the way before it strikes? Obliterate it with a nuclear explosion? Those are the ...

Next month it will have been 80 years since the Japanese cities of Hiroshima and Nagasaki were devastated by nuclear attacks. More than 200,000 people – mostly citizens – would die by the year's end ...

WASHINGTON - This is what the U.S. government imagines would happen if terrorists set off a nuclear bomb just blocks away from the White House: The explosion would destroy everything in every ...