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The Fermi Paradox

The Universe is inconceivably huge. No human brain will ever actually understand what does its dimensions mean. Just a few numbers to illustrate: the observable Universe is estimated to be around 90 billion light years in diameter. One light-year is more than 5,8 trillion miles long. There are a least 100 billion galaxies, the smallest ones contain 100 billion stars. Almost every star have planets orbiting around it, which means that there are trillions and trillions planets. It takes a lot of effort to actually realise these numbers. People might ask: so, where are the aliens?

Let’s just stick to our galaxy, which is big enough to search for alien life. The Milky Way is 100 thousand light-years across., and the funny thing is that our galaxy is a relatively small one. Based on the Kepler telescope’s mission data, there could be 40 billion Earth-sized planets in the habitable zones of Sun-like stars in the Milky Way. (The habitable zone means that the planet is neither too close and …

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