Correct: earth is 12000 km in diameter, the earth is 4.6 billion years old, our sun is 1.3 million km in diameter, sun dose not have a surface, pulsars spin at 1500 times/s, Incorrect: earth is 18400 km in diameter, the earth is 5.9 billion years old, our sun is 2.5 million km in diameter, sun dose have a surface, pulsars spin at 2700 times/s,

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