does it imply that getting out into space is a lot harder than it sounds?
It enforces a statement along the lines of "these aliens got space travel recently or getting out into space is a lot harder than it sounds." That's weak evidence, at least, for that claim.
But if those are aliens, then aliens must be common. And if aliens are common, then there should have been tons of them that got to the space travel point long enough ago to have reached us by now.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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