Suppose a Scientist Holds a Press Conference at Which He

question 87

Multiple Choice

Suppose a scientist holds a press conference at which he claims that 10% of the matter in the Milky Way is in the form of dust grains. Does his claim seem reasonable? Why or why not?

• A)The 10% figure is too high because there are not enough heavy elements to make that much dust.
• B)The 10% figure is too low because most of the mass of the galaxy is in the form of interstellar dust.
• C)It is reasonable because we already know that interstellar dust obscures our view through the disk of the galaxy.
• D)It seems reasonable as long as we assume that red giant stars-which produce dust grains in their stellar winds-are more common than we thought.

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Definitions:

Pulses Of Light

Rapidly fluctuating light beams used in technologies like fiber-optic communications to transmit data.

Light Waves

Electromagnetic waves visible to the human eye, responsible for the phenomenon of sight.

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Device that is connected by a cable to the main router that amplifies a wireless signal to otherwise unreachable locations.

Wireless Connectivity

A type of network connection that doesn't require cables and allows devices to communicate through radio waves or infrared signals.