What the Heck is Dark Matter?
Special | 8m 55s | Video has closed captioning.
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?
Problems Playing Video? | Closed Captioning