Dark matter and dark energy are two things we measure in the universe that are making things happen, and we have no idea what the cause is.

I'm just recommending you find other things to base your spirituality on, rather than where science is yet to tread.

So maybe part of our formal education should be training in empathy. Imagine how different the world would be if, in fact, that were 'reading, writing, arithmetic, empathy.'

Give a kid a book, and you change the world. In a way, even the universe.

Robots are important also. If I don my pure-scientist hat, I would say just send robots; I'll stay down here and get the data. But nobody's ever given a parade for a robot. Nobody's ever named a high school after a robot. So when I don my public-educator hat, I have to recognize the elements of exploration that excite people. It's not only the discoveries and the beautiful photos that come down from the heavens; it's the vicarious participation in discovery itself.

In five billion years, the sun will expand and engulf our orbit as the charred ember that was once Earth vaporizes. Have a nice day

Deep down within anyone there's a flame that maybe had gone dormant that can be fanned or ignited in case it had blown out. This is the flame of curiosity, the flame of wonder, of awe, of all the things that make you want to learn something more tomorrow than you knew today.