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.
你吸入的下一口空气有可能来自比冥王星更遥远的地方。
这不仅改变了我们对太阳系的认识，也使我们意识到向冥王星发射飞船的重要性。
This transformed our view not only of the solar system but also of the importance of sending a spacecraft to Pluto.
冥王星不属于这两类，因为它离地球太远，体积又小，使得它的真正性质成为一个谜。
Pluto is not included in either category, because its great distance from Earth and its small size make this planet's true nature a mystery.
现在，冥王星可能是个矮行星，但是，亲爱的克莱德，在我书中你仍然是第一个发现行星的美国人。
Pluto may be a dwarf planet now, Clyde baby, but you're still the first American to discover a planet in my book.
按照它们与太阳的距离排列，这些行星分别是水星、金星、地球、火星、木星、土星、天王星、海王星和冥王星。
The planets, in order of their distance from the Sun, are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto.
它比冥王星更大，并且离太阳更远。
他们决定取消冥王星的行星资格了。
可以发现，水星比冥王星近100倍。
冥王星该不该是颗行星？
冥王星在太阳系外宇宙有着它自己的家族。
按照官方说法，冥王星仍然算不上一颗行星。
冥王星直径不到1500英里，位于太阳系边缘。
Pluto is less that 1, 500 miles in diameter and lies at the edge of the solar system.
冥王星现在被认定为一颗处于柯伊伯带中的矮行星。
Pluto is now considered a dwarf planet dwelling in the Kuiper belt.
印有“冥王星是一颗行星”字样的T恤衫正在热卖。
它还揭示了冥王星像地球上一样的季节性变化。
在1930年，年轻的天文学家克莱德·汤博发现了冥王星。
In 1930, a young astronomer named Clyde Tombaugh found Pluto.
行星变暖现象已被观测到，例如，火星、木星和冥王星都在变暖。
It has been observed, for instance that Mars, Jupiter and Pluto are all warming up.
实际上，特里同的大小和组成都和冥王星接近，说明两者起源相似。
Indeed, Triton is about the same size as Pluto and has a similar composition, suggesting a similar origin.
通过向冥王星发射探测飞船，我们能对这些特点有一个更细致的了解。
By sending a spacecraft to Pluto, we'll get much closer look.
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。
Later that year the planet was officially named Pluto, on the suggestion of an 11-year-old British lass.
2010年2月是美国天文学家克莱德·汤博发现冥王星的80周年纪念。
February of 2010 marks the 80th anniversary of the discovery of Pluto by American astronomer Clyde Tombaugh.
所幸的是，冥王星会对经受住考验的人有所报偿，所以秋天时你会看到回报。
Thankfully Pluto rewards those who go through its ordeals, so there's something for you to look forward to in the fall.
据行星学家罗宾·卡纳普说，冥王星的所有三个卫星可以追溯回同一次撞击。
According to planetary scientist Robin Canup, all three of Pluto's satellites could trace back to a single impact.
顺便提一句，新地平线，四年前的一个星期二发射，预计2014年到达冥王星。
New Horizons, by the by, launched four years ago this past Tuesday, and is slated to arrive at Pluto in 2014.
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。
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。
The only other known example of such an oddly angled orbit was Pluto, until its demotion to dwarf planet status.
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