How do we know that the Milky Way has a spiral structure?
A) By plotting the distances and directions of objects known to be in spiral arms
B) By viewing the galaxy from a point well above its plane
C) By observing the changing conditions as the sun enters a spiral arm
D) By observing the gravitational influence of the arms on nearby galaxies
Correct Answer:
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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
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
Q26: Which of the following is a true
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