dark matter

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so, this dark matter stuff has gravity
lots of it that exists where it shouldn’t be

for it appears by all accounts that nothing is there
and if not for the gravity we would be left totally unaware

physicists mostly think this is caused by undiscovered particles
at least, that’s what I read in simple layman articles

but I wonder if this unexplained gravity is leaking through
from another parallel universe just out of our view