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Does alien life exist somewhere? Yes. Absolutely. It would be impossible for it not to given the size of the universe and the laws of probability.
Is that alien life multicellular? Again. Yes. For the same reason as above. In a functionally infinite universe, the roll of the dice is going to come up at least a few times.
Is that alien life intelligent? Maybe. But in my opinion, probably. Intelligent life arose here after many many stops and starts. It's probably that given enough kicks at the can, multicellular life can evolve intelligence on any planet where it arises if the conditions are right.
Has that intelligent life visited us? No. No intelligent life has ever left their own solar system except possibly in the form or a one-way generation ship.
Life evolves, either biologically or technologically, because of competition for resources. From the most basic amoeba competing for the heat from a steam vent at the bottom of an ocean, to humans competing for oil and minerals, life is about resources gathering.
So what happens when we finally are able to access the resources of the solar system, which are effectively limitless (at least from a human perspective)? Nothing. We stagnate. There's no impetus to go further than that. Scientists may want to. But pure science is a myth. People paying the bills are what drive us forward. and it's reasonable to assume that any life that evolves would do so facing the same pressures.
we always find ways to use the virtually limitless and some people always want to push the boundaries. We certainly, if limited to what we know now, use lasers to accelerate solar sail ships or some such with some other engine for braking or such. That is if we don't just straight out find some new technology once we understand physics more.
Any physics grad can tell you that life visiting earth from another planet is impossible, because with absolute proof we know physics is truly universal.
We might find bacteria in a comet or meteor fragment.
Life finds a way...if there is a reason to do so.
My point is, once we've secured all the resources in the solar system, there is no reason to find a way.