In our vicinity,the galactic disk is about 100 times wider than it is thick.
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Q5: The core of the Milky Way, Sagittarius
Q7: William Herschel's original model for our Galaxy
Q8: It is harder to map the structure
Q10: The majority of the mass of the
Q12: Shapley found that globular clusters are only
Q14: Spiral arms are regions of star formation,
Q15: The Earth lies close to the center
Q16: The rotation curve for our Galaxy shows
Q20: Population I stars came billions of years
Q36: The period-luminosity relation is critical in finding
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