Ultraviolet light from the exposed core of an average sized star at the end of its main-sequence life ionizes and excites the ejected gases,producing a
A) planetary nebula.
B) supernova remnant.
C) corona.
D) photosphere.

Question

Quizplus · Accepted Answer

Ultraviolet light from the exposed core of a star ionizes and excites the ejected gases, producing a planetary nebula. This occurs when a star is at the end of its main-sequence life and has exhausted its nuclear fuel. The outer layers of the star are ejected into space, and the hot, exposed core emits high-energy radiation that ionizes the gas, causing it to emit light of various colors. This creates the beautiful, glowing clouds that we see as a planetary nebula.

Ultraviolet Light from the Exposed Core of an Average Sized