In case of intelligent life:
If friendly, i would try to establish contact! If not, i would try to hide and avoid leading them to Earth! In both cases, i would notify the scientists and governments on our planet.
In case of bacteria:
There are many approaches. Some say we should study bacteria if we find them on other planets, some say to leave them alone and some say to foster them – help them survive and prosper. I am mostly for the latter part.
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