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並前往https://www.nationalgeographic.com/science/article/151104-newton-einstein-gravity-vulcan-planets-mercury-astronomy-theory-of-relativity-ngbooktalk

The Hunt for Vulcan, the Planet That Wasn't There ...

Enter Vulcan—the so-called “other” planet—first observed in 1859; confirmed by the greatest astronomer of the day, Urbain Le Verrier; and hailed ...

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