太空望远镜拍下了有史以来最清晰的冥王星的照片。
The space telescope has taken the clearest pictures ever of Pluto.
天文学家们知道冥王星和海王卫一拥有几乎相同的体积、质量和密度。
Astronomers know that Pluto and Triton have nearly the same size, mass, and density.
这大约相当于从地球往返冥王星337次的距离。
That's about the same distance as 337 round trips from Earth to Pluto.
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