Astronomers Have Noticed That the Visible Filaments in the Crab

question 30

Multiple Choice

Astronomers have noticed that the visible filaments in the Crab Nebula are moving toward us at great speed. How can they know about motions like this?

• A) from the width of the pulsar pulses
• B) from the color of the nebula's continuous radiation
• C) from the spacing of the pulsar pulses
• D) from the H-R diagram
• E) from the Doppler shift in the line radiation from the nebula

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Definitions:

Extraction Costs

The expenses associated with the removal of natural resources from the earth, such as mining for minerals or drilling for oil.

Long-Term Stream

A sustained flow of actions or processes, often referring to investments or financial commitments that span a lengthy period.

User Cost

The cost of using a good or service, including the opportunity cost of forgone alternatives and the depreciation of the good's own value over time.

Government Regulation

The imposition of laws and rules by government aimed at affecting the behavior of individuals and industries to achieve societal goals.