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OpenStudy (anonymous):
Scientists believe that about 20 to 25% of the universe is made of ________. a. dark energy b.dark matter c. hydrogen
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OpenStudy (anonymous):
dark energy/matter constitutes a majority of the universe i guess
OpenStudy (stormfire1):
It's dark matter. That's the theory anyway.
OpenStudy (stormfire1):
Check this out...from NASA:
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