In modern times, if the sole measure of what’s out there flows from your five senses then a precarious life awaits you.

You know, dark matter matters.

I am proud to be part of a species where a subset of its members willingly put their lives at risk to push the boundaries of our existence.

I've accomplished enough in life so that I do not fear death.

I wake up and I go to work. I don't look for the cup of coffee. The universe is enough of a draw for me - to awaken me and have me bound out of bed and go to my office.

I don't want people to say, 'Something is true because Tyson says it is true.' That's not critical thinking.

If we have the power to turn another planet into Earth, then we have the power to turn Earth back into Earth.