Dinosaurs are extinct today because they lacked opposable thumbs and the brainpower to build a space program.

Trillions of years into the future, when all stars are gone...all parts of the cosmos will cool to the same temperature as the ever-cooling background. At that time, space travel will no longer provide refuge because even Hell will have frozen over. We may then declare that the universe has died-not with a bang, but with a whimper.

For your own safety, do not ever tell an astrophysicist, I hope all your stars are twinkling.

NASA has spin-offs, and it's a huge and very impressive list, including accurate and affordable LASIK eye surgery.

The most successful scientists in the history of the world are those who posed the right questions

As the plow pushes through a parking lot of light fluffy snow, the snow clumps together in bigger and bigger chunks. Out in space, pressure hitting a gas cloud has a similar effect, except, instead of snowballs, you get stars!

America has an economy reversing relative to other nations in the world. And I want to turn that around. And one way I know to turn it around is to get everyone excited about what it is to innovate again.