Science

Which planet's orbit is the most circular?

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What is energy from the internal heat of the Earth called?
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Which of these is the best definition of a compound machine?
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Which of these is similar to the way sound travels?
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The Sun's mass is approximately how many times as great as Earth's?
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What scientist discovered that sunspots occur in an eleven-year cycle?
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Earthmen first sent a spacecraft to which planet?
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What are plants that need two years to complete its life cycle?
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How many tons of meteor dust fall to Earth every day?
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