Science

How many years are in a sunspot cycle?

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The obscuring from sight of one celestial body by another is also by what scientific term?
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Who was the first person to use a telescope for astronomy?
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How many planets are there in the solar system?
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What means having two eyes facing forward?
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What do our bodies need from the air we breathe?
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What unit is force measured in?
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Which of these is defined as "part of the electromagnetic spectrum that contains visible light"?
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To which part of physics does the Archimedes' Principle refer?
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