Are we alone in the Universe? With more than 100 billion galaxies in the observable universe and at least 500 billion planets ...

The best alien invasion movies feature the most exhilarating stories about extraterrestrial visitors, from War of the Worlds to Annihilation.

Here are some ways the world might end in ice, according to science fiction. Earth freezes. Humankind’s remnants huddle in ice caves, fending off giant alien monsters (Snowball Earth). Or people ...