Science

What is the opening of a lens, which controls the amount of light?

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Which planet is named for the Roman goddess of love?
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Which of these objects would be attracted to a magnet?
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Which Pioneer spacecraft first visited the planet Saturn?
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The Horsehead Nebula can be found in what constellation?
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Which of these is a virus that doesn't immediately cause damage to tissue?
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The definition of "highest instantaneous wind speed observed or recorded" best fits which science term?
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What word is the definition of 100,000 BTUs?
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