Mapping dark matter may help solve a cosmic mystery

Aired: 4/14/2015 | 0:04:57 | Clip
We can't see dark matter, but scientists have made the largest map yet of the invisible material that helps make up the universe. Researchers used a dark energy camera and a large telescope to create a color-coded chart of just a small part of the cosmos. Jeffrey Brown talks to Sean Carroll of the California Institute of Technology about how they did it and why it matters.