There inevitably exists or has existed lifeforms elsewhere in the universe, which is more or less infinite and therefore has produced more or less infinite environments for life to exist, and that is only if we take into consideration what we believe to be the correct environment for life to exist. If we expand what we think of as being suitable for life, then the possibility expands as well.
I am less convinced they have visited us. But one night long ago in a car ride, I asked by NASA-employed father if aliens exist. He said yes and was about to say something further but stopped. Years later I asked him about this and he denied ever saying such a thing, although I know he did.
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