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Card 6

Front

Who proposed the heliocentric model?

Back

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Card 7

Front

When did he propose it?

Back

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Card 8

Front

What did the heliocentric model state?

Back

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Card 9

Front

What were the flaws in the model?

Back

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Card 10

Front

What are elliptical orbits?

Back

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Card 11

Front

Who observed the night sky using a telescope in the 17th century?

Back

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Card 12

Front

What did he see?

Back

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