The solar system should be viewed as our backyard, not as some sequence of destinations that we do one at a time.

But to carve the Grand Canyon, Earth required millions of years. To excavate Meteor Crater, the universe, using a sixty-thousand-ton asteroid traveling upward of twenty miles per second, required a fraction of a second. No offense to Grand Canyon lovers, but for my money, Meteor Crater is the most amazing natural landmark in the world.

I don't see why there is no intelligent alien life in the universe.

I love the future we might invent for ourselves that I have not yet dreamt of.

If you look at Einstein's equations and put in low speeds and low gravity, they become Newton's equations.

If we want to unlock the secret behind the origin of our sun and its planets, it would be helpful to find some remnants from the birth itself, an event that took place about four-and-a-half-billion years ago.

There is no true understanding of Biology without Chemistry. And there's no true understanding of Chemistry without Physics.