What amazes me as much as whats out there on a grander scale, is the fact that the scale continues in the smaller direction as well, and as far as we know we haven't yet reached the end of that trail- it may also be 'infinite'. And many of the things that exist on that smaller scale would be deemed aliens if we were to find them on another world, bacteria for example, and we have millions of them living on us and in us, yet in reality we know very little about them.
Its mind-boggling in both directions....
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