Suppose You Read Somewhere That 10 Percent of the Matter

question 9

Multiple Choice

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) There is nothing surprising about 10 percent figure s because dust grains are the material from which stars are born.
• B) Given how easily dust grains can form, 10 percent is a surprisingly low fraction.
• 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.

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