几个世纪以来，科学家一直认为彗星是在地球大气层内运行。但是在1577年，由丹麦天文学家第谷·布拉赫进行的观测揭示出，彗星实际上运行在比月亮还远的地方。

For centuries, scientists thought comets traveled in the Earth's atmosphere, but in 1577, observations made by Danish astronomer Tycho Brahe revealed they actually traveled far beyond the moon.

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