Trắc nghiệm: Around 150 B.C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness,Around 150 B.C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness,Around 150 B. C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness.,Around 150 B. C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness.,Around 150 B.C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness.,Around 150 B.C the Greek astronomer Hipparchus developed a system to classify stars according to brightness.

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Around 150 B.C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness, Around 150 B.C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness, Around 150 B. C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness., Around 150 B. C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness., Around 150 B.C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness., Around 150 B.C the Greek astronomer Hipparchus developed a system to classify stars according to brightness.

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