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Approximately how far is the Sun from the center of the galaxy?
Q1: Process of Science: Describe how scientists measure
Q18: Earth is about 150 million km from
Q21: How are low-mass red giant stars important
Q42: Spectral lines from Galaxy B are redshifted
Q55: Which of the following statements best explains
Q62: Why does the temperature of the gas
Q63: Which of the following characteristics of stars
Q72: Suppose the star Betelgeuse (the upper left
Q93: If we could watch spiral arms from
Q95: Which of the following sequences correctly describes