Think about aliens for a second..
If they were from distant universes and our civilization are the equivalent of planet hoppers that leave our garbage behind then the question is if we hop why don't they.. Think the big and little dipped both have a link was it the first time parrelel dimensions was seen in the sky and it's a alien patrolled space.. what about orion.. we know the belt but does anyone think a whole body is mapped out taking claim..
So next time you look in space think what shape do we make to them we are all constallationalist aren't we?