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For stars on the main sequence, the luminosity can be estimated using the ____________ relation.
Q9: The method of finding the distance to
Q11: What properties of a star determine its
Q25: What is the sidereal period of the
Q30: The angular resolution of a telescope is
Q31: The _ shows that sunspots are associated
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Q85: _ appear reddish or pink in colour
Q91: In a reflecting telescope, the primary is
Q101: Which of the following observations could be