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staedtler staedtler
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7 years ago
In the sky, a star-like point source of light is found to emit intense but fluctuating radio energy and to show emission lines in its visible spectrum that are extremely redshifted. What is this object?

(a)   A quasar
(b)   A pulsar
(c)   A Cepheid variable
Textbook 
Discovering the Universe

Discovering the Universe


Edition: 7th
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hyponoticahyponotica
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7 years ago
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staedtler Author
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7 years ago
Grinning Face Exactly what I needed
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