Suppose you read somewhere that 10 percent of the matter in the Milky Way is in the form of dust grains. Should you be surprised? If so, why?
A)Given how easily dust grains can form, 10 percent is a surprisingly low fraction.
B)There is nothing surprising about the 10 percent figure because dust grains are the material from which stars are born.
C)The fraction of 10 percent is surprisingly high because dust grains can form only at low temperatures.
D)The fraction of 10 percent cannot be correct. Dust grains are solid and only 2 percent of the matter in the galaxy is made of anything besides hydrogen and helium.

Question

Quizplus · Accepted Answer

The Milky Way is primarily composed of hydrogen and helium, with only about 2 percent of its matter being heavier elements, including dust grains. Therefore, 10 percent is an incorrect and surprisingly high figure for dust grains.

Suppose You Read Somewhere That 10 Percent of the Matter