Mark all below that apply to dark energy (the ones not checked apply to dark matter).多项选择题

A

Is continuously being created as time goes on

B

A particle that seems to only interact via the gravitational force

C

A source of extra gravity that keeps galaxies together

D

Is completely unlike any known fundamental particle

E

Was necessary for the formation of the first galaxies

F

Is causing the expansion of the universe to accelerate

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