While the theory predicted this, it wasn't until 1 948 that a scientist named Hendrik Casimir suggested that even though we can't see these particles, they should cause empty space to do something we can see. And he predicted that if you take two ordinary metal plates... and place them extremely close together-- say, closer together than the thickness of a sheet of paper-- then particles with certain energies would be excluded because in some sense, they wouldn't fit between the plates.
Y predijo que si se cogen dos placas de metal corrientes... y se las coloca extremadamente cerca... más cerca que el grosor de una hoja de papel... entonces las partículas con determinadas energías serían excluidas porque en cierto sentido, no encajarían entre las placas.