00:00All right, how many of you know what planet this is?
00:22Anyone?
00:24Don't you recognize it?
00:30It's Earth.
00:32Remember?
00:36Let me show you on the map.
00:40It's not so impressive from here, is it?
00:43It's hard to believe that one day that little thing was the horizon of our lives.
00:47There were practical reasons to leave home, of course.
00:50The rewarding resources, the remote possibility that an asteroid would hit us.
00:55But it was never common sense or necessity that led Columbus to the New World or propelled man to the Moon.
01:02It was something else, something that we almost carried in our DNA.
01:05An insatiable curiosity and a desire to explore.
01:09So you have to assume that, once we get the technology we need,
01:13it's inevitable that humanity will end up looking for a new home among the stars.
01:25NASA Jet Propulsion Laboratory, California Institute of Technology
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