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noblegas
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matter in The universe is thought to be made up of 75 percent hydrogen and helium is thought to make up 25 percent of helium; Dark matter is thought to make up 25 percent of the universe and 75 percent dark energy; that's an interesting coincidence. , and currently physicists are not certain about what the elemental constituents of dark energy, and dark matter are. Why haven't the elements hydrogen and helium been suggested as the main candidates for dark energy and dark matter?