哈勃太空望远镜最近发现了第四颗绕行冥王星的卫星。天文学家们暂时把它命名为P4。该是迄今为止发现的围绕这颗冰雪覆盖的矮行星的最小的卫星。
Hubble recently showed a fourth moon orbiting Pluto. Astronomers temporarily named it P4. The moon is the smallest to be discovered around the icy dwarf planet.
更奇怪的是，在1978年科学家宣传他们发现了一颗冥王星的卫星，它的体积居然达到冥王星体积的一半，这颗卫星也就成为了已知卫星中与其母星体积相比最大的一颗。
Adding to the oddities, in 1978 scientists announced they'd found a moon of Pluto—but one that's almost half its size, making it the largest moon in relation to its parent body.
据行星学家罗宾·卡纳普说，冥王星的所有三个卫星可以追溯回同一次撞击。
According to planetary scientist Robin Canup, all three of Pluto's satellites could trace back to a single impact.
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