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Bull. "Now consider the opposite hypothesis, namely that "extraterrestrial intelligent life exists." How could this hypothesis be falsified? The only way to falsify it would be to prove that absolutely no intelligent life exists anywhere in the entire universe other than on (or from) earth. Because that is obviously impossible to prove, this hypothesis fails the falsifiability criterion and is therefore "unscientific." "
The search of entire universe is possible, at least in theory.

"The search of entire universe is possible, at least in theory."

It certainly isn't in practice. Actually, it isn't even in theory -- the universe is infinite. It would take an infinite number of searchers, an infinite amount of time to search the universe. That's even assuming that they know what to look for -- we cannot say that we know all the forms that "life" can take. Perhaps there are an infinite number of possible life forms. If we don't know what we're looking for; how would we even know what sensors to use.