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Physics 12 Online
OpenStudy (anonymous):

where dose the energy from the sum come from ? a.the force of its own gravity b.the fusion of hydrogen c.the fission of helium d.its iron core ?

OpenStudy (stormfire1):

b

OpenStudy (fretje):

philosophically there is a catch. The answer is b, but i would start a discussion with the teacher, to say that one needs enough gravity to reach clean fusion of hydrogen atoms.

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