Which element's atoms make up roughly 75% of the normal baryonic mass of the entire universe?
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Hydrogen is the simplest and most abundant element in the cosmos, powering stars through nuclear fusion. Helium comes in second at about 24%, meaning these two light gases make up almost all of the matter we can see. Photo: Alchemist-hp (talk) (www.pse-mendelejew.de), Wikimedia Commons, FAL.
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Source: Wikipedia (CC BY-SA)
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