In order of visual luminosity at the start,which is most luminous?
A) a red supergiant
B) a planetary nebula
C) a nova
D) a type I supernova
E) a type II supernova

Question

Quizplus · Accepted Answer

Type I supernovae are the most luminous at the start of their explosions, releasing an enormous amount of energy that outshines their entire host galaxy for a brief period. Red supergiants, planetary nebulae, and novae all have relatively lower luminosities. Type II supernovae are also very luminous, but not as much as Type I.

In Order of Visual Luminosity at the Start,which Is Most