| Astronomers are scientists |
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| Ancient civilizations did not have the instruments |
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| The Greeks and Romans used the stars |
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| At first, people thought |
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| Galileo was the first astronomer |
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| Johannes Kepler proved |
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| Powerful telescopes can show |
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| An Earth-orbiting telescope |
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| Astronomers use computer simulations |
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| Our galaxy, the Milky Way, |
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