The following questions refer to the sketch of the H-R diagram below.Please choose the best answer in each case,i.e. ,choice (a)refers to the entire main sequence,while (c)and (d)refer to only small parts of the main sequence.If choice (c)or (d)offers a better answer to a particular question than (a),use the best choice.You may use the same choice more than once.

-Which group represents stars that are cool and dim?
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Q57: The apparent brightness of a star depends
Q58: If the distance between us and a
Q59: Cluster ages can be determined from
A)main sequence
Q60: In order to understand star clusters,we need
Q61: Two stars,Fred and Barney,are of the same
Q63: Which is brighter in our sky,a star
Q64: Refer to the choices in the table
Q65: Two stars,Betty and Wilma,are both on the
Q66: Refer to the choices in the table
Q67: Earth is about 150 million km from
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