The rotation curve for our Galaxy shows stars beyond the Sun moving slower than expected.
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Q11: As Curtiss thought, our Milky Way is
Q12: Shapley found that globular clusters are only
Q13: The instability strip includes many main sequence
Q14: Spiral arms are regions of star formation,
Q15: The Earth lies close to the center
Q17: The center of the Milky Way lies
Q18: In our vicinity, the Galactic disk is
Q19: RR Lyrae stars pulsate, but with shorter
Q20: Population I stars came billions of years
Q21: Early in the 20th century, our Galaxy
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