It’s short-sighted to think ads won’t one day end up wherever humans are - even the moon.

So what is true for life itself is no less true for the universe: knowing where you came from is no less important than knowing where you are going.

Eventually, the Sun will swell to occupy the entire sky as its expansion subsumes the orbit of earth. Earth's surface temperature will rise until it matches the 3,000-degree rarified outer layers of the expanded Sun.... But not to worry. We will surely go extinct for some other reason long before this scenario unfolds.

You like to explore things, and your parents don't like it because it gets the pots and pans dirty, and because it's noisy - but for you it's fun, you're resting. You're actually doing experiments... Just tell your parents that they're experiments, and you want to become a scientist, and then they won't stop you from doing anything you want.

The most creative people are motivated by the grandest of problems that are presented before them.

Curiosity is a self-driven motivation to explore and to learn. Learning is like... you know, you have to take your medicine. And that is what it has become. And that's unfortunate.

The more I learn about the universe, the less convinced I am that there's any sort of benevolent force that has anything to do with it, at all.