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.

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。

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With each new measurement, Pluto got lighter and tinier, until astronomers realized that the object is in fact smaller than Earth's moon and has a very low density.

用各种测量方法重新测量后，冥王星变轻了、变小了，这时候天文学家才意识到冥王星实际上还不如月球大，并且密度也很小。

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Pluto has a moon, Charon, half the size of the planet.

冥王星唯一的卫星卡戎，大小是冥王星的一半。

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The concern is not necessarily that New Horizons, which launched in 2006, will slam into a Pluto moon that has thus far eluded detection.

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Sometimes they need a little help from something like the Hubble Space Telescope, but its our peepers that ultimately spotted Pluto's fifth moon, P5.

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Charon, Pluto's largest moon, is named after the ferryman who carried the souls of the newly deceased across the River Styx, which divided the world of the living from that of the dead.

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