The greatest of people that have ever been in society, they were never versions of someone else. They were themselves.

There's an old saying in the space community: 'If God wanted us to be a spacefaring species, he would have given us a moon'.

As important as the civil rights movement was, I think what will rise to the top is that we left Earth in that time.

If Neptune were analogized with a Chevy Impala in mass, then how big is pluto compared to that? Pluto would be a matchbox car sitting on the curb.

People like death and mayhem.

The remarkable feature of physical laws is that they apply everywhere, whether or not you choose to believe in them. After the laws of physics, everything else is opinion.

I'm fascinated by the deaths of stars and the havoc they wreak on their environments.