00:00You raise your eyes to the nocturne and you don't see... nothing.
00:04Well, okay.
00:05Not exactly nothing.
00:06You see stars.
00:07But not enough.
00:08If the universe is full of stars to infinity in all directions,
00:12why the sky doesn't shine so much light?
00:15This is one of many cosmic synonyms waiting for another answer.
00:19Why are black holes in the shadows?
00:22Why is the universe not able to decide on the speed of which it stands?
00:26Yes.
00:27These paradoxes have so many rules that we could say that they completely destroy reality.
00:33The universe is infinite, isn't it?
00:34There are stars and stars and even more stars without fin.
00:37But then, if it's the case,
00:39how does the sky nocturne not illuminate like Times Square during the New Year?
00:44This question is at the heart of the paradoxes of Holbers,
00:47named, according to the astronomer of the 19th century, Heinrich Holbers.
00:51He was not the first to notice the problem,
00:53but he made it famous in asking this question fondamentale.
00:56If there are stars in all directions,
00:58the whole sky doesn't need to be light?
01:01You may say, they are simply too far.
01:04But in an infinite universe,
01:05we should fall on a star in each direction where we look.
01:09And all their light should be added.
01:11So why is it dark?
01:13The answer is maybe that the universe is not infinite in time.
01:17He had a beginning.
01:18The Big Bang.
01:19That means that the light of the stars the most far away
01:22has not yet had the time to reach us.
01:25And the light that has traveled for hundreds of years,
01:27has been so tired by the expansion of the cosmos
01:30that it is now invisible to our eyes.
01:32And so,
01:33this universe of absolute light is not void.
01:36It could be filled with light.
01:38But we simply cannot see it.
01:40Maybe it is an indication.
01:42A sign that the universe has had a beginning.
01:44A story that we have not yet discovered.
01:47Well,
01:48so,
01:48the space is more sombre than it should be.
01:50But you know what is even more strange?
01:53It is also much too silencieux.
01:55You probably ask the question since you are little.
01:58The universe is immense.
01:59There are billions of stars with planets in orbit all around.
02:03And a certain number of these planets
02:04should look a little to the Earth.
02:07Which means...
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