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Q8: Unlike Jupiter and Saturn, at Uranus and
Q25: Most comets are discovered when their coma
Q26: Why does Mars appear fainter than Venus,
Q28: William Herschel thought he had found a
Q38: Dactyl was photographed by the Galileo spacecraft.
Q63: Which of the following objects never collide
Q63: Mercury's tenuous atmosphere of sodium, magnesium, and
Q66: What role did solar radiation play in
Q106: The continuing rise in the carbon dioxide
Q108: As with Saturn's F ring, shepherd moons