dark matter
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Letter D
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dark matter Definition
(n) (
cosmology
)
a
hypothetical
form
of
matter
that
is
believed
to
make
up
90
percent
of
the
matter
in
the
universe
;
it
is
invisible
(
does
not
absorb
or
emit
light
)
and
does
not
collide
with
atomic
particles
but
exerts
gravitational
force
dark matter Synonyms
dark matter
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