Astronomers of about the year 1900 didn't know of the existence of interstellar dust.As a result they
A) Underestimated the size of the galaxy.
B) Thought the globular clusters were located in other galaxies
C) Did not believe that our galaxy had spiral arms
D) Believed stars were much bluer than they really are
Correct Answer:
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Q13: What assumption about globular clusters did Harlow
Q14: What effect do interstellar dust particles have
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
Q19: What keeps the matter in an HII
Q20: Why has the 21 cm emission line
Q21: How do we know that the Milky
Q22: Which of the following kinds of objects
Q23: Consider a star that orbits the galaxy
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