Emission nebulae like M42 occur only near stars that emit large amounts of
A) ultraviolet radiation.
B) microwaves.
C) X- rays and gamma rays.
D) infrared heat.
E) visible light.
Correct Answer:
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Q20: Most molecules found in the interstellar medium
Q21: Interstellar gas is composed mainly of
A) only
Q22: Some regions along the plane of the
Q23: Compared to an open cluster, a globular
Q24: Young open clusters contain a lot of
Q26: A star cluster with a lot of
Q27: Globular clusters contain mostly blue stars.
Q28: What is the primary visible color of
Q29: For bright stars to form, the protostars
Q30: What happens to light passing through even
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