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How often does sunspot activity reach its lowest point?

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Ian Shelton, who discovered Supernova 1987A, while observing in Chile, was working for what university?
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What was the name of the first artificial satellite launched into space?
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What section of an insect's body are the legs and wings attached to?
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What is the study of stars, planets and galaxies called?
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A "philatelist" is a what?
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What determines how loud or soft a sound is?
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