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Can't it really be that the black holes are something else?
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like that thing around the kick area of this emoticon...
All jokes aside now, as cold says, you most likely mean wormwholes, not black wholes. Black whole is a supermassive, super dense, theoretical object, so massive infact, that light fails to escape it's gravitational field. Since the object theoretically exists, we have no clue as to what their dimensions are, not what their structure is like. Assuming that a black whole collapses to a cingularity point doesn't prove that cingularity leads to other universes, nor that wormwholes exist, nor that the black wholes are the gateways into them.
Theoretically a wormwhole is a geodesic in the curved spacetime, it kind of doesn't connect 2 universes.
oh and that wall/ball experiment, you might see shadow, depending on how the light is set up, you might not however see any shadow at all
