Spiral arms are
A) solid features.
B) clumps of gas and dust that travel together.
C) tracks that stars follow to leave the galaxy.
D) density fluctuations in a galaxy's disk.
E) bipolar outflows from the galactic nucleus.
Correct Answer:
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Q2: The oldest stars in the galaxy are
Q3: The Milky Way Galaxy is a(n) _
Q4: The figure shown below immediately reveals that
Q5: The dark bands pictured in the figure
Q6: The most distant globular clusters are found
Q8: Why is 21-cm radiation one of the
Q9: If dust is present between Earth and
Q10: What type of standard candles did Shapley
Q11: The Sun is located approximately
A) halfway out
Q12: Any single star in the Milky Way
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