The universe has really never made things in ones. The Earth is special and everything else is different? No, weโve got seven other planets. The sun? No, the sun is one of those dots in the night sky. The Milky Way? No, itโs one of a hundred billion galaxies. And the universe - maybe itโs countless other universes.
Neil deGrasse TysonSome morning while your eating breakfast and you need something new to think about, though, you might want to ponder the fact that you see your kids across the table not as they are but as they once were, about three nanoseconds ago.
Neil deGrasse TysonPeople say, oh we just need charismatic leaders to continue on to Mars. Now we've gone to the moon, of course Mars is next. No. Mars was never, of course, next. It is next if you think we went to the moon because we're explorers, but if you know we went to the moon because we were at war then we're never going to Mars. There's no military reason to do it, to justify the expenditure.
Neil deGrasse TysonWhy can't we summon the ingenuity and courage of the generations that came before us? The dinosaurs never saw that asteroid coming. What's our excuse?
Neil deGrasse TysonWith no gravitational force to work against, your body not only doesn't need the same amount of muscle and bone, it starts breaking them down. As on Earth, so in space: use it or lose it. And exercise may not solve the problem.
Neil deGrasse Tyson