The bluish color of the nebulosity around the Pleiades is produced by
A) Starlight reflected by interstellar grains
B) Emission lines of hot neon gas
C) Continuous radiation from very hot gas
D) Synchrotron radiation.
Correct Answer:
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Q10: The hydrogen in an HII region is
A)In
Q11: Why are HII regions red in color?
A)They
Q12: What kind of object creates an evacuated,very
Q13: What assumption about globular clusters did Harlow
Q14: What effect do interstellar dust particles have
Q16: What atom produces 21 cm radiation?
A)Hydrogen
B)Nitrogen
C)Silicon
D)Oxygen
Q17: A reflection nebula is produced when the
Q18: Astronomers of about the year 1900 didn't
Q19: What keeps the matter in an HII
Q20: Why has the 21 cm emission line
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