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It seems really unlikely. A planet with life on it would be very far away and we don't even know where. Also if another planet's lifeforms become intelligent enough to master space travel and move across solar systems and galaxies why would they give a fuck about us?
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That's like asking why people travel halfway around the world just because someone discovered a new lizard. The discovery of a new race, no matter how inferior, would probably be enough to motivate them. Of course, if it was purely to study and observe, we'd probably never even know.