The
observable universe it at least 93 billion light years in diameter. It is likely that the galaxies within our visible universe represent only a minuscule fraction of the galaxies in the universe. This universe contains more than 80 billion galaxies, each of which contain from ten million to one trillion stars.
To think that life only evolved on earth, and nowhere else, is a ridiculous thought that can only be justified if one is religious and believe that God created us as the centre of the universe.
Considering mathematical probabilities, life would have had millions of other opportunities to evolve in this vast expanse of trillions upon trillions of stars. Even in our own "small" solar system, there is evidence pointing to
life elsewhere. In fact, there is a possibility that the building blocks of life on earth could have come from outer space via meteorites.
Whether intelligent extraterrestrial life had opportunity and the ability to reach earth, is another question, and far less likely.
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