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Culture and Discovery

The planet that killed Pluto

作者:21ST
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科学家测量出阋神星直径。词数 345 建议阅读时间 5分钟

THERE used to be nine planets in our solar system. In 2006 that number became eight, when Pluto (冥王星) was reclassified as a dwarf planet (矮行星).
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