1930 - The planet Pluto is officially named.
1930年的今天，冥王星被正式命名。
1978 - Charon, a satellite of the planet Pluto, is discovered.
1978年的今天，冥王星的冥卫一卫星被发现。
The planet Pluto and the moon Triton have almost the same size and density.
冥王星与海卫一几乎同样大小，同样密度。
The planet Pluto and the moon Triton have almost the same size and density.
冥王星与海卫一几乎同样大小，同样密度。
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