Most of the energy released during a supernova is emitted as neutrinos.

Question

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During a supernova, a tremendous amount of energy is released in the form of neutrinos, which can escape the star almost immediately. While some of the energy is also released as visible light and other forms of radiation, the majority of it is in the form of neutrinos. Neutrinos are produced in large quantities during a supernova and carry away most of the released energy. However, some of the energy is also released in the form of light and other radiation.

Most of the Energy Released During a Supernova Is Emitted