Around us in the galactic plane, we find stars of a variety of ages and compositions.
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Q15: The Earth lies close to the center
Q17: Our Sun lies about 30,000 light-years out
Q18: All RR Lyrae stars are about 5
Q19: RR Lyrae stars pulsate, but with shorter
Q20: William Herschel made the first map of
Q20: Population I stars came billions of years
Q22: Stars within an emission nebula, such as
Q24: The two stellar populations are extremes, but,
Q25: Halo stars are all Population II objects.
Q26: The rotation curve for our Galaxy shows
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