What the Heck is Dark Matter?
Special | 8m 55s
85% of the mass of our universe is made up of dark matter--a type of matter that we cannot see or detect, but without it, galaxies would not exist and the universe as we know it would be very different. What is dark matter? Where is dark matter? How can we find dark matter?
Aired: 09/08/16Video has closed captioning.