Dark matter and dark energy are two things we measure in the universe that are making things happen, and we have no idea what the cause is.

We didn't go to the moon to explore or because it was in our DNA or because we're Americans. We went because we were at war and we felt a threat.

It's progress I think, that science has joined philosophy, metaphysics & religion as subjects drunk people argue about in bars.

Mars once was wet and fertile. It's now bone dry. Something bad happened on Mars. I want to know what happened on Mars so that we may prevent it from happening here on Earth.

As children we all wonder - we wonder all the time. And that gets lost in adulthood. It gets beaten out, it gets filtered out or diluted out.

Like no other science, astrophysics cross-pollinate s the expertise of chemists, biologists, geologists and physicists, all to discover the past, present, and future of the cosmos-and our humble place within it.

Climate change has taken on political dimensions. That's odd because I don't see people choosing sides over E=Mc2 or other fundamental facts of science.