Suppose You Read Somewhere That 10 Percent of the Matter

question 44

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 of the matter being dust grains because dust grains are the material from which stars are born.
• B)Given how easily dust grains form,10 percent is a surprisingly low fraction of material to be in that form.
• C)Ten percent is surprisingly high because dust grains can form only at low temperatures.
• D)The 10 percent figure cannot be correct,because dust grains are solid but only about 2 percent of the matter in our galaxy is made of anything besides hydrogen and helium.

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Definitions:

Skin Temperature

A measure of the warmth of the skin surface, influenced by blood circulation and environmental factors.

Dorsum

The upper side or back part of an organ, structure, or body.

Presbyopia

A common age-related eye condition that results in difficulty focusing on close objects.

Diminished Near Vision

A condition in which an individual experiences a decrease in the ability to see objects clearly at a close range, often due to aging.