Patterns of Earth and Sky
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a scientist who studies stars, planets, and other objects in the universe
astronomer
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an arrangement of stars as seen from Earth
constellation
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a period of time that is 24 hours long and includes daytime and nightime
day
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a description of how something works or why something happens
explanation
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information that supports an answer to a question
evidence
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an attempt to find out about something
investigation
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the pull between Earth and other objects, which acts even without touching
gravity