Henrietta Leavitt first showed the relationship between the mass and luminosity of Cepheidsand their period of pulsation; the brighter, the longer this period.
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Q2: The Milky Way is simply our edge-on
Q3: A pulsating variable star with a period
Q4: Shapley found the Sun is located about
Q5: The core of the Milky Way, Sagittarius
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Q7: William Herschel's original model for our Galaxy
Q8: It is harder to map the structure
Q9: Shapley correctly argued that the rotation of
Q10: The majority of the mass of the
Q11: As Curtiss thought, our Milky Way is
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