The universe is near limitless with billions of galaxies. Every one of these billions of galaxies contain with in them millions of stars which have their own solar systems - and many of these solar systems contain more planets than our own. So, if you look at t from that perspective, it is utterly irrational to deny the existence of extraterrestrials.
You have to remember as well that our planet is relatively young, there are others out there millions of years older so the posibility of other life forms with a far greater advancement in technology or somethiung utterly different altogether makes the concept of UFO's, in my opinion, totally conceivable
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