Chasing Shadows

Particle Mysteries: The Coldest Case

Where there are suspects, there’s a lineup. Physicists have started to define what exactly dark matter could be through a combination of computational modeling, hints from experiments, and some good old thinking outside the box. But that has produced a wide range of potential candidates for dark matter. So let’s ask: who are you, dark matter? What do you really look like, and what are you really up to?