One day, probably far off in the very distant future, if astronomers are correct in their assumptions about the vastness of space, Earth will be visited by intelligent beings from another planet.

What would happen if we stole water from other planets and dumped it on Earth? Would we flood instantly, grow alien fish, or unlock cosmic chaos? This video explores the wild, weird, and ...

I do so love an ostentatious comet. As I wrote in a recent “The Universe” column, when these dusty ice balls are billions of kilometers from the sun, they’re frozen solid. But as they near our star on ...