LISTEN LIVE

Adam Frank

The countdown has begun. It's T-minus a month or so until the 50th anniversary of Apollo 11 — and humanity's first and famous steps on another world.

Human civilization began about 10,000 years ago with dawn of agriculture (give or take a millennia or so). This seems like such a long time that it can be hard to reconcile with the short span of our lives.

But there is another way to look at it that puts not just civilization, but the whole of your ancestry, in a different light.

Jon Morse, former astrophysics division director at NASA, can remember the exact moment he knew things had to change.