Why do we think that quasars are extremely distant?
A. They are very bright.
B. They are very faint.
C. Their light varies rapidly.
D. Their spectra show immense redshifts.
Answer: D
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Indicate whether the statement is true or false
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A. 912 Hz B. 919 Hz C. 1000 Hz D. 1090 Hz
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What will be an ideal response?