NOVA — S32E03 — Origins: Where Are the Aliens?

00:00:05 SUBTITLED BY ANDROMMEDA

00:02:24 For example, in the film Alien,

00:04:38 Now, when we look at these aliens,

00:06:21 there were other planets something like the Earth out there.

00:08:29 So what are the chances of finding intelligent aliens in all that real estate?

00:10:33 it needs some solid ground to call home,

00:12:26 so they use a special technique.

00:14:14 And we thought, "Well, we'll just go up and take data on this star, 51 Pegasi,

00:16:16 and then the other planet around 70 Virginis.

00:18:24 We're finding new planets like crazy, all the time.

00:20:35 the percentage of planets where life does arise.

00:22:48 Here on Earth, the chemistry of life relies heavily on the element carbon.

00:24:55 including the ice sheets of Antarctica and Greenland.

00:27:22 The photos reveal clear sedimentary layers in the Martian rocks,

00:29:15 we're getting more optimistic that life may be widespread.

00:31:19 And intelligent life,

00:33:45 surely earth is repeated many places, many times. Why not?

00:35:48 The big guys didn't stand a chance.

00:38:04 behavior that is their main defense from ending up as dinner.

00:40:28 We call it a computer.

00:42:52 Searching for alien signals night after night can test anyone's patience,

00:44:54 I, for one, couldn't sit down; I was sort of pacing around.

00:47:14 And yet, who can blame us for trying?

00:49:03 and our place in the universe.