Why has the 21 cm emission line been especially useful for studying the structure of the Milky Way galaxy?
A) Stars emit very strongly at 21 cm
B) The 21 cm radiation travels to us at the speed of light
C) Twenty-one cm emission is produced only in the core of the galaxy
D) Twenty-one cm radiation is unaffected by interstellar dust
Correct Answer:
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Q15: The bluish color of the nebulosity around
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
Q21: How do we know that the Milky
Q22: Which of the following kinds of objects
Q23: Consider a star that orbits the galaxy
Q24: In order to make a scale model
Q25: Which of the following is true of
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