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How big is 冥卫叁?

400 kilometers!

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冥卫叁

Hydra 是冥王星的卫星之一, 它是以希腊神话的七头蛇命名, 如果你砍了牠一颗头, 牠会长 出两颗. 如果你想要牠有 n 颗头, 只需要砍掉牠的 n-7 颗头! 不过当然 n 小於七就不能 这样算了.

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