Using the technique of main-sequence fitting to determine the distance to a star...

M

mrpickles69

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...cluster requires that _______? a)we have telescopes powerful enough to allow us to identify the spectral types of main-sequence stars of many masses in the cluster

b)the cluster be near enough for us to measure the parallax of its stars

c)we use ultraviolet and X-ray telescopes

d)we have a well-calibrated period-luminosity relation for Cepheid variable stars
 
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