Ask an Astrophysicist

The universe is being pushed apart at a faster and faster rate. And the culprit? Dark energy. Astrophysicist Adam Riess shared the 2011 Nobel Prize in Physics for that discovery, and now’s your chance to ask him about it–or anything else you’ve been wondering about the cosmos.

As background, here’s a look back at some of our recent astrophysics coverage.

Segment Guests

Adam Riess

Adam Riess is an American astrophysicist at Johns Hopkins University and the Space Telescope Science Institute. He lives in Baltimore, Maryland.