Supernova remnants differ from star forming regions because, although there is ionizedhydrogen in both, supernova remnants:
A)don't look like star forming regions.
B)are much bigger than star forming regions.
C)are located far from star forming regions.
D)are more diffuse than star forming regions.
E)contain no ionizing stars.

Question

Quizplus · Accepted Answer

Supernova remnants contain no ionizing stars because the star that could have provided such ionization has already exploded in the supernova event, unlike star-forming regions where young, hot stars ionize the surrounding hydrogen gas.

Supernova Remnants Differ from Star Forming Regions Because, Although There