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
Correct Answer:
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