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People stay and work here in space.
space station
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The Sun and the group of planets that move around it.
the solar system
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This is an alien spaceship.
a UFO
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The night sky is full of these.
stars
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The distance through a planet from one side to the other side.
diameter
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Earth is one of these.
a planet
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We use this to look at the night sky.
a telescope
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This orbits the Earth.
the Moon
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He/She flies in a rocket.
an astronut
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We use this to fly to the moon.
A rocket
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The only star we can see during the day.
The sun
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It flies through the sky. It's got a tail and it's hot.
a comet
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