We know that the central object in a planetary nebula has a surface temperature of at least ____ because the nebula contains large amounts of ionized hydrogen.
A)50 K
B)100 K
C)500 K
D)5,000 K
E)25,000 K

Question

Quizplus · Accepted Answer

The central object in a planetary nebula must have a surface temperature of at least 25,000 K to ionize hydrogen, as ionization requires high energy typically provided by very hot stars.

We Know That the Central Object in a Planetary Nebula