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Q16: Asteroids are the last of the icy
Q22: Stars with masses equal to or less
Q27: Explain why the observable properties of quasars
Q30: Which is the correct order of the
Q38: O and B stars only occur in
Q43: Compared to other spiral galaxies, the Milky
Q58: Arno Penzias and Robert Wilson are famous
Q59: In a binary system containing two neutron
Q67: Jupiter and Saturn are so massive that
Q70: A massive star can fuse more and