Most of universe consists of “matter and energy” of an

unknown  nature, which astrophysicists call “dark”

and which is believed to be  distributed in a weblike

structure. “Dark energy”, which causes an accelerated

expansion of the  universe after the Big Bang that

created  it, accounts for some 72 percent of the total

and “dark matter” accounts for 23 percent and 4.6 percent

comprises “baryonic matter”, the category for the protons and

neutrons that compose it.



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