Once classified as a true planet, icy Pluto is now considered one of the more than 40 dwarf planets in our solar system.

它曾一度被划归为行星，冰冷的冥王星目前被认为是我们太阳系的40多个矮行星之一。

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The only other known example of such an oddly angled orbit was Pluto, until its demotion to dwarf planet status.

唯一的另一个已知的以如此奇怪的角度运行的例子是冥王星，直到它降级为矮行星。

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Later that year the planet was officially named Pluto, on the suggestion of an 11-year-old British lass.

后来，这个行星被正式命名冥王星，在一个11岁的英国女孩的建议下。

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He died long before the search for Planet X resulted in the discovery of Pluto.

VOA: special.2010.07.11

Here, just so you can compare, are photos that the Hubble Space Telescope took of the planet Pluto, the outermost planet.

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But part of the problem with the definition - I mean, as an example - is that if you look at Mars - if Mars - if we discovered a Mars-sized object out beyond the orbit of Pluto, it couldn't be a planet, because over the age of the solar system it wouldn't have time to clear its orbit.

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But the host is likely to be between 3, 000 and one million times fainter than the Sun, so the top of the planet's atmosphere is likely to be colder than Pluto.

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