The thickness of the Galaxy near the Sun is about 1000 light-years.
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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
Q28: Planets are expected to be found orbiting
Q29: Cepheids are good examples of cataclysmic variable
Q30: The bright blue stars of Orion's Belt
Q31: Harlow Shapley mapped the Milky Way using
Q32: The globular star clusters are the most
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