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Q15: How old is the universe since the
Q16: There is a mass-luminosity relation because<br>A) hydrogen
Q18: The pressure of a gas depends on
Q19: An E galaxy contains<br>A) mostly lower-main sequence
Q26: Brahe's universe was the same as the
Q32: Helium fusion is called the triple alpha
Q36: The spring tides occur during the new
Q44: A group of 10 to 100 stars
Q48: Recent high resolution radio observations show that
Q51: An M star is hotter than an