The Greatest Thing in the Universe Weโve Never Seen!
Dark matter is a kind of matter that we canโt see or touch, but it is what makes up all of the mass in the universe. We know about dark matter because of its very strong gravity. Dark matter holds galaxies together, bends light, and forms the large web of matter in space. In this video, we'll look at the most convincing signs of dark matter in the universe. Galaxy Rotation Rates Galaxy Cluster Collisions Light from the Big Bang



















