冥王星的公转时间相当于248个地球年，所以要等到下一个机会，需要很长时间。

Pluto completes a full orbit once every 248 Earth years, so it would be a long wait for the next prime opportunity to visit.

我们感谢美国地质调查局, 庆祝国际地球年.

Our thanks to the US Geological Survey, celebrating the International Year of Planet Earth.