____ is(are) believed to be produced by supernova explosions.
A) Coronal gas
B) HI clouds
C) Molecular clouds
D) Reflection nebulae
E) Dark nebulae
Correct Answer:
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Q19: Elements such as iron,calcium,and titanium are less
Q20: Molecular clouds can be observed
A) using infrared
Q21: _ require(s)that a young hot star
Q23: Which of the following is evidence of
Q25: Stars are born in
A)reflection nebulae.
B)dense molecular clouds.
C)HII
Q26: Which of the following is evidence of
Q27: _ is(are)believed to make up 50 percent
Q28: Coronal gas
A) causes stars to look bluer
Q29: The emission lines from O III are
Q100: Molecular clouds are mapped using CO instead
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