ok i will tell my reasons. first, god put us on earth because he wanted us to be here. he designed it specifically for us and even died right here on this planet to save us its inhabitants. oall other nearby planets are not in any way suited for human life.
i believe that space is a place that god created for himself to enjoy personally. if it was not for this purpose, why would it need to be so big? he could have put whichever planets that contained life much closer together while still keeping them sufficiently apart so that their gravity does not interfere with their movements. also why would there be uninhabited planets revolving around suns whose heat has no purpose? there is no reason for them to exist other that for god's enjoyment. and theyre not for our enjoyment, because we obviously cant get to them. were not even anywhere near advanced enough to go to the moon (the whole thing was faked).
last, space is, as i believe, a vast, perfect, uncorrupted place. the earth is the only panet that is corrupted by sin (unless the aliens are sinful beings too). so for what reason should we (or the aliens, for that matter) go into space, corrupting this beautiful piece of perfection with our evil nature?