From where does the sun derive its energy?


Fusion happens when two or more nuclei (plural of nucleus) of atoms collide with each other to produce a new type of nucleus. The masses of the combining nuclei are greater than the mass of the resulting nucleus. This lost mass is converted into energy during combination. This is the energy that we receive from the sun.
Supplement: Fission involves the splitting of heavy metals like uranium. The sun is made of light gases like hydrogen that collide and ‘fuse’ under the pressure of gravity.

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