The Privileged Planet | movie | 2004 | Official Trailer - video Dailymotion

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This 60-minute video documentary explores the conditions on Earth that allow for intelligent life and also make it a str | dG1fOG9odUczVmpfNDg

Transcript

00:00 [MUSIC PLAYING]

00:28 A lot of things went right on Earth

00:30 to have yielded complex life, absolutely.

00:33 The number of factors that have been postulated has grown.

00:39 Currently, the typical number you would see in a typical list

00:42 would have something like 20.

00:46 We find that we need to be at the right location

00:48 in the galaxy, that we're inside the circumstellar habitable

00:51 zone of a star, that we're in a planetary system

00:54 with giant planets that can shield the inner planets

00:56 from too many comet impacts, that we're

00:58 orbiting the right kind of star that's not too cool or not

01:01 too hot, that we're on a planet that

01:04 has a moon that can stabilize the tilt of its axis,

01:08 that we're on a planet that's a terrestrial planet, a planet

01:11 that has a crust that's just thick enough that it can

01:14 maintain plate tectonic activity,

01:16 that it has enough heat in its interior

01:18 that it's still circulating its liquid iron cores

01:20 so it can generate a magnetic field,

01:22 that it has an atmosphere that has enough oxygen to allow

01:26 for complex organisms to survive,

01:29 that it has enough water and enough continents

01:32 to allow for the diversity of life or an active biosphere

01:35 that you need to support complex creatures such as ourselves.

01:39 All these factors have to be met at one place and time

01:43 in the galaxy if you're going to have a planet as

01:46 habitable as the Earth, which you

01:48 need for complex and even technological life.

01:52 In an attempt to estimate the probability of attaining

01:55 this combination of factors simultaneously,

01:59 some researchers have developed equations

02:01 assigning a conservative 1 in 10 value

02:05 to each factor deemed necessary for advanced life.

02:09 If every element has to be there at the same time,

02:12 you have to multiply the probabilities.

02:14 And that's what makes the probability at the end so

02:16 small.

02:16 You've got 10% of this and 10% of that.

02:19 And these things rapidly multiply

02:21 to exceedingly small numbers, numbers

02:23 on the order of 10 to minus 15, which is 1/1000th of 1/1 trillion.

02:27 And it's a number like that that you

02:29 have to compare to the 100 billion stars that

02:31 are in the galaxy.

02:32 100 billion is a very large number,

02:34 but 1/1000th of a trillion is much, much smaller.

02:38 On their face value, these probabilities are speaking.

02:42 What they're telling us is this can't happen,

02:45 or this is very unlikely to happen in the galaxy.

02:48 And that's where the evidence is pushing us.

02:51 There are many probabilistic resources in the galaxy,

02:54 but on the other side of the coin

02:56 are all these factors that you need.

02:59 You have to get just right in order

03:01 to have just one habitable planet like the Earth.

03:04 And that leads me to conclude that, yes, we're

03:07 rare in the galaxy.

03:09 [MUSIC PLAYING]

03:13 [MUSIC PLAYING]

03:17 [MUSIC PLAYING]

03:20 you

The Privileged Planet | movie | 2004 | Official Trailer

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