The center of the Milky Way lies in the direction of the constellation Cygnus.
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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
Q16: The rotation curve for our Galaxy shows
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
Q22: Both RR Lyrae and Cepheid variable stars
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