What processes were occurring when this photograph was taken or at some time in the recent past?
A. attraction of mass by gravity, formation of stars via nuclear fusion, and emission of electromagnetic radiation
B. ejection of the outer envelope of gas and plasma
C. nuclear fusion and nucleosynthesis of helium, convection in the interior, emission of electromagnetic radiation and heat
D. nuclear fusion, gravitational attraction of material, and movement and rotation of a galaxy
Answer: C
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