Quasars were first discovered in which region of the electromagnetic spectrum?
A) X-ray
B) Cosmic ray
C) Radio
D) Infrared
Correct Answer:
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Q27: Elliptical galaxies appear red because
A) they are
Q28: What makes up the majority of the
Q29: Long-lasting spiral density waves occur in the
Q30: What could you use to measure
Q31: The dark matter in galaxies is _
Q33: How did astronomers determine that elliptical galaxies
Q34: Spiral structure can be triggered in a
Q35: If the rotational speed of the gas
Q36: Which of the following would NOT be
Q37: A galaxy rotation curve is a plot
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