Like ghosts in the void, virtual particles can materialize from (almost) nothing.

If dark matter particles decay, then scientists could hunt for signs of this process, including X-ray or gamma-ray radiation or even emitted "ghost particle" neutrinos, in vast clusters of galaxies.

A clever mathematical tool known as virtual particles unlocks the strange and mysterious inner workings of subatomic particles. What happens to these particles within atoms would stay unexplained ...

"Hearst Magazines and AOL may earn commission or revenue on some items through these links." If there weren’t any planets, stars, comets, asteroids, or other cosmic debris flying around, there would ...