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Q3: On the H-R diagram, red supergiants like
Q9: A moon that goes inside the Roche
Q20: According to general relativity, objects moved on
Q21: Unlike supernovae, novae can explode more than
Q27: What did the Voyager mission discover about
Q65: The core of the Milky Way, Sagittarius
Q72: Type II supernovae have little hydrogen in
Q75: To fully describe the apparent motion of
Q87: Io's "pizza pie" colors come from eruptions
Q90: The density of the Sun is most