What did Harlow Shapley discover about globular clusters that allowed him to determine the size of the galaxy and the Sun's location within it?
A) The clusters are confined to a thin plane
B) The clusters are all located at the same distance from the Sun
C) The center of the distribution of clusters is far from the Sun
D) All of the clusters are located in a region a few parsecs across
Correct Answer:
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Q2: How did Harlow Shapley discover that our
Q3: What kind of star is located at
Q4: The distance to the center of the
Q5: The distance to the center of our
Q6: We cannot see the other side of
Q7: What property of globular clusters made it
Q8: Interstellar dust grains produce
A)Radio emission at a
Q9: The 21 cm line is emitted by
A)Hydrogen
Q10: The hydrogen in an HII region is
A)In
Q11: Why are HII regions red in color?
A)They
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