Dark Matter Reveals the Structure of the Universe
by BIG THINK EDITORS NOVEMBER 20, 2013, 12:00
Physics is both deeply inspiring and deeply humbling, in a way that few other disciplines are today. On the one hand, physicists have found the elusive Higgs boson, the particle responsible for mass. On the other hand, physicists are comparatively clueless when it comes to dark matter, which makes up the vast majority of the Universe.
Comparatively clueless, that is to say, but not completely clueless.
In the video below, Joel Primack, an astrophysicist at the University of California-Santa Cruz, explains that we don’t yet know the real nature of the dark matter “beyond that it’s pretty cold.” Cold refers to the terminology that Primack coined in 1983. Dark matter is either hot, warm or cold “depending on how rapidly it’s moving in the early stages of the Big Bang,” Primack says.