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Astronomy Lesson 3 - Mercury

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Across
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Mercury is the ___ planet to the sun.
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When there is no person on a spacecraft it is called an ___ spacecraft.
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Compared to Earth, Mercury spins very ____.
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The 1st unmanned spacecraft to orbit Mercury
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Earth-like
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Mercury does not have an ___, which makes it very hot in the day and very cold at night.
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Made of gas
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At night, Mercury gets colder than a ___.
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On Mercury, the sun would appear ___ in color all the time.
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Several photographs taken separately but compiled into one is called a ___ photo.
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An object revolving in an oval pattern
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Named Mercury