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What characteristic of a star primarily determines its location on the main sequence
Q16: The Local Group of galaxies is dominated
Q16: How is radioactive dating used to determine
Q30: A G2 I star is _ in
Q40: The condition of _ means that the
Q43: _ galaxies contain large clouds of gas
Q58: _ are located beyond the asteroid belt
Q67: The region of Jupiter that is responsible
Q68: How does the unified model of AGN
Q82: In A.D. 1054, Chinese astronomers observed the
Q111: If the theory that novae occur in