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Study
OD4-Unit 2
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He/she studies objects in the sky
Astronomer
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a machine that explores universe
Space probe
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The inner part of a planet
core
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The distance across a circle through its centre
diameter
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A planet goes around another planet
orbit
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To go from one place to another
distance
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Large round pits
craters
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Solid, liquid, gas
matter
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Being the only one of its kind
unique
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