What property of globular clusters made it possible to study them in order to discover important information about the structure of the Milky Way galaxy?
A) Nearly all of them are located in the core of the galaxy
B) Nearly all of them are located at the same distance from the Sun
C) Most of them are located in the spiral arms of the galaxy
D) Their distribution is centered on the center of the galaxy
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Q2: How did Harlow Shapley discover that our
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Q8: Interstellar dust grains produce
A)Radio emission at a
Q9: The 21 cm line is emitted by
A)Hydrogen
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A)In
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A)They
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