What is the source of energy that allowed supernova 1987A to continue to brighten slowly for a few months after its initial explosion?
A) Radioactive decay of specific nuclei produced in the explosion
B) Thermonuclear reactions between iron nuclei and protons,neutrons,and helium nuclei
C) Thermonuclear reactions between hydrogen nuclei in the shell of gas surrounding the supernova,triggered by the shock wave from the explosion
D) Slow gravitational compression of the remnant core of the supernova and the consequent release of gravitational potential energy

Question

Quizplus · Accepted Answer

The source of energy that allowed supernova 1987A to continue to brighten slowly for a few months after its initial explosion was the radioactive decay of specific nuclei produced in the explosion. As these nuclei decayed, they released energy that continued to power the brightness of the supernova.

What Is the Source of Energy That Allowed Supernova 1987A