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"My belief in the presence of intelligent life elsewhere in the universe is purely a matter of statistics. There are 135 billion stars in our galaxy, that's just in our galaxy, there at least 100 billion other galaxies like our own, among these 135 billion stars, a certain moderate percentage are like our own sun, of these stars almost all would be expected to have a planetary system, a certain moderate percentage would be bound to include a planet very much like our earth, on such a planet life would be almost sure to develop, because scientists don't think life and evolution are a miraculous accident, it follows almost inevitably from certain well known chemichal changes." Isaac Asimov
A video I've edited about the possibilities of extraterrestrial life.