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澳洲天空划过绿色“火球” 专家解析夜空奇观

About the episode

5月21日傍晚，一颗罕见的火流星点亮了天空，发出耀眼的绿色光芒。这颗流星为什么会特别明亮？绿色光芒又意味着什么？它真的比一般流星更罕见吗？点击音频请听天文专家李伟才先生的解析。