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Card 16

Front

WHAT IS A LIGHT YEAR

Back

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Card 17

Front

WHAT SPEED DOES LIGHT TRAVEL AT

Back

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Card 18

Front

WHAT ARE THE TWO METHODS OF MEASURING HOW FAR AWAY A STAR IS

Back

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Card 19

Front

WHAT IS A RED SHIFT

Back

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Card 20

Front

WHAT HAPPENED ACCORDING TO THE BIG BANG THEORY

Back

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Card 21

Front

WHAT IS DARK MATTER

Back

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Card 22

Front

WHAT WILL HAPPEN IF THE UNIVERSE STOPS EXPANDING

Back

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Card 23

Front

WHAT IS ROCK RECYCLING

Back

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Card 24

Front

WHAT IS WEGENER'S THEORY OF CONTINETAL DRIFT

Back

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Card 25

Front

WHAT EVIDENCE SUPPORTS HIS THEORY

Back

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