Science

How many Skylab Missions went up in space?

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The Sun's mass is approximately how many times as great as Earth's?
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Which of the following is not a constellation?
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Of which body system is the kidney an organ?
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What scientist discovered that sunspots occur in an eleven-year cycle?
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Which aeronautical term is a moveable surface on an aircraft which controls its motion?
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Who is credited with identifying HIV as the cause of AIDS?
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Where is the observatory where Percival Lowell first theorized the existence of Pluto?
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How many years are in a sunspot cycle?
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