Water going down a drain . . . does NOT disappear !
It goes somewhere where it is collected, filtered, purified and pumped back up into pipes of homes.
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Speculation is rife . . . no one ever came back from a black hole to tell us where all the matter goes !
But my take is . . . it either goes to a parallel universe . . . or it's a two-way highway!
Stuff that is sucked up here is shat out there . . . and stuff that is sucked up there . . . is shat out here !
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But matter won't disappear !
That's for sure !