Science

What is the study of stars, planets and galaxies called?

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What scientist is credited with developing the first vaccine?
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Earthmen first sent a spacecraft to which planet?
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Which planet is named for the Roman goddess of love?
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What part of the plant conducts photosynthesis?
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Who was the first President of the "Planetary Society", an organization of amateur astronomers?
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What tool do people at sea use to measure distance with echoes?
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Which parts of a flower are often brightly-colored and have many different shapes?
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What does Earth's tilted axis mainly affect?
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