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Physics 7 Online
OpenStudy (anonymous):

According to the nebular hypothesis, when did nuclear fusion begin? After the planets formed. When the sun was 5 billion years old. When the nebula first exploded outward into space. When particles were pulled together so tightly they combined.

OpenStudy (unklerhaukus):

fusion is two atoms becoming one

OpenStudy (anonymous):

so what is the answer??

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