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So the Milky Way has an estimate 100 billion stars and there's an estimate 100 billion galaxies. The Ingredients that make up life as we know it are abundant in the universe.
In modern physical cosmology, the cosmological principle is the notion that the distribution of matter in the universe is homogeneous and isotropic when viewed on a large enough scale, since the forces are expected to act uniformly throughout the universe, and should, therefore, produce no observable irregularities in the large scale structuring over the course of evolution of the matter field that was initially laid down by the Big Bang.
Without knowing what was the spark of life on Earth, (assuming life started here and wasn’t transferred from someplace else) can we really surmise it ever happened a second time in the Universe?
If there is an infinite number of galaxies in the universe then the probability that there's life elsewhere in the universe is 1. A probability of 1 means that its exactly 100% certain. If that's true then it follows from that that there's an infinite number of worlds which have intelligent life on them.
It is almost certain that life (i.e. selfreplicating molecules) could evolve on any planet that has liquid water.
Why would we think life on Earth is anything more than a fluke, when you consider all the factors mentioned above?