Solar energy is due to
A. Chemical reaction
B. Combustion reaction
C. Nuclear fission reactionD. Nuclear fusion reaction

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Solar Energy is the energy coming from the Sun. The sun generates energy in its core in a process called nuclear fusion. During nuclear fusion, the sun's extremely high pressure and hot temperature cause hydrogen atoms to come apart and their nuclei (the central cores of the atoms) to fuse or combine. This phenomenon is termed as Nuclear Fusion.