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Q26: How can we be sure that the
Q27: Why do scientists consider it to be
Q42: Which of the following is most likely
Q45: An intention to discriminate must be shown
Q47: A planet whose size is in between
Q54: Which of the following is NOT a
Q60: What does the resolution of Olbers's paradox
Q70: What is believed to be the cause
Q74: Saturn's belts and zones are obscured by
Q104: Which of the following processes appears to