@cosmosziwei: 水星的“一天”要先问怎么算：自转一圈约 59 个地球日，公转一年约 88 个地球日，一个完整昼夜循环（太阳日）却约 176 个地球日，相当于约两个水星年。动画为加速科学示意，非实际轨道比例。你最想体验哪颗星球的一天？ On Mercury, a spin takes about 59 Earth days, an orbit about 88, and a full solar day about 176—roughly two Mercury years. The animation is a simplified, accelerated diagram, not to scale. Which planet’s day would you explore? #Mercury #SpaceFacts #Astronomy #SolarSystem #NASA

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Wednesday 30 September 2026 20:14:19 GMT