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In the 50s, the chemist Stanley Miller will try an experiment with the aim of recreating life from scratch.
With water, gases and a few electrodes, it can reproduce conditions close to what happened 3.5 billion years ago.
As a result, the first living bricks appeared at the bottom of his test tube.
Yes, life was born out of a chemical reaction, and there is every reason to believe that this chemistry may have occurred elsewhere in the universe.
Several mathematicians have proposed algorithmic models to estimate the number of planets harboring life
You imagine, just our galaxy with its 100 billion planet, statistically, there is necessarily life elsewhere; statistically, looking up at the sky, you look at 10 civilizations more advanced than ours.
So why is the universe so quiet for us? Why don't we collect the slightest proof of life?
You’ll see with science, being visited by extraterrestrials is much more complicated than you think: very far from the stereotypes conveyed by Hollywood.
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Some Sources :
Quelques Sources :
bbc.com/future/article/20150809-how-fast-could-humans-travel-safely-through-space
en.wikipedia.org/wiki/Fermi_paradox
en.wikipedia.org/wiki/Great_Filter
www.space.com/25325-fermi-paradox.html
en.wikipedia.org/wiki/Arecibo_message
en.wikipedia.org/wiki/Pioneer_plaque
en.wikipedia.org/wiki/Drake_equation
mason.gmu.edu/~rhanson/greatfilter.html
en.wikipedia.org/wiki/Tabby%27s_Star
en.wikipedia.org/wiki/Miller%E2%80%93Urey_experiment