What is the reason a type I supernova slows its dimming after about 2 months?
A) The planetary nebula cooled enough to form a dust shell.
B) Energy is released from the decay of radioactive cobalt 56 to iron 56.
C) The supernova remnant suddenly becomes transparent.
D) The burst of energy carried by neutrinos is finally observed.
E) Energy from the supernova's shock wave is released as it hits interstellar matter.

Question

Quizplus · Accepted Answer

Type I supernovae occur when a white dwarf star exceeds its maximum mass limit and undergoes a runaway nuclear fusion reaction that rapidly consumes the star's material. During this process, large amounts of radioactive cobalt 56 are formed. As this cobalt 56 decays into iron 56, it releases energy in the form of gamma rays which then interact with the surrounding material, slowing down the dimming of the supernova. This process can last for several months before the supernova remnant fades away.

What Is the Reason a Type I Supernova Slows Its