Science

What does a ruler measure?

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What is Earth's nearest neighbor in space?
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How many moons does Earth have?
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What is the opening of a lens, which controls the amount of light?
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What was the name of the first artificial satellite launched into space?
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What word is given to sounds that are too high for humans to hear?
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What branching nerve fibers receive messages?
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Which planet has Phobos as a moon?
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How many years does it take for Mars to go around the Sun for a complete revolution in its orbit?
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