Is the universe a closed system?

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Probably, maybe not though.

yes

ur mums legs sure arent closed system lmao

No

i doubt we'll ever figure that out as a species

50-50 chance imho

what if it's both? it can be open or closed, depending on time

maybe

I intuit its semi closed, like its not in contact with "outside" but doesn't maintain the typical closed system dynamic because of the funky nature of creating more space as it expands etc.