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30 June, 00:07

Which of the following properties do astronomers look at in order to classify stars? A. color B. size C. brightness D. all of these

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  1. 30 June, 00:25
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    The answer was B. Brightness because They are classified by distance, brightness (magnitude) or spectrum. There are five main types of star spectrums, called A, F, G, K, M. White A type stars are the hottest (e. g. Sirius, Rigel) while red M type ones are the least hot (Betelgeuse).
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