intro to the solar system
a simple talk about the solar system
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a longer introductiona dn starting point
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Unlock at Level 2
the sun
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Unlock at Level 2
Mercury
An indepth look at Mercury
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Unlock at Level 3
Venus
An in-depth look at Venus
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Unlock at Level 3
Earth
Part 1 of a look at our home world
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Unlock at Level 4
Earth part 2
The second part to look at our home planet
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