scientists explain that about ¾ of our universe is hydrogen and about ¼ of it is helium. Think back to what you learned about how stars form and how they produce energy. Think about what kind of evidence scientists use to understand what stars are made of. Make a scientific argument about the composition of our universe.
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scientists explain that about ¾ of our universe is hydrogen and about ¼ of it is helium. Think back...
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