If you were to take a voyage through the entire disk of the Milky Way, what kind of material would you spend most of your time in?
A) empty space-a pure vacuum
B) hot bubbles of ionized hydrogen
C) star clusters
D) rarefied clouds of atomic hydrogen
E) cool, dense clouds of molecular hydrogen

Question

Quizplus · Accepted Answer

The majority of the material in the Milky Way is hydrogen, and the most common form of hydrogen in our galaxy is atomic hydrogen. This form of hydrogen is found in rarefied clouds throughout the disk of the Milky Way, making it the material you would spend most of your time in if you were to take a voyage through it. Options A, B, and C are not as common in the disk of the Milky Way as option D. Molecular hydrogen is also common in the Milky Way, but it is found in cooler and denser clouds, which are not as prevalent as atomic hydrogen clouds.

If You Were to Take a Voyage Through the Entire