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Card 6

Front

How do we know the universe is expanding?

Back

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Card 7

Front

What are asteroids?

Back

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Card 8

Front

What is a Binary asteroid?

Back

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Card 9

Front

What is a star?

Back

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Card 10

Front

What are comets?

Back

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Card 11

Front

What makes planets spherical?

Back

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Card 12

Front

What is a moon?

Back

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Card 13

Front

Why is it often hard to see the stars in cities and towns?

Back

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Card 14

Front

How old is the Earth?

Back

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Card 15

Front

What is the diameter of the Sun?

Back

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