Pluto was demoted to a newly created category, "dwarf planet," in 2006, partly because of the discovery a year earlier of Eris, another icy body from Pluto's neighborhood.
冥王星在2006年被降格至一个新创造的类别，“矮行星”，部分原因是在那之前一年，在冥王星的轨道附近，一颗名叫厄里斯的冰态天体被发现。
Eris is real, but it is a dwarf planet similar to Pluto that will remain in the outer solar system; the closest it can come to Earth is about 4 billion miles.
行星厄里斯是真的，但它是一个和冥王星类似的矮行星，将继续待在太阳系外围；它最接近地球的位置有大约40亿英里。
Pluto, Eris and the many other Kuiper Belt objects are far too different to be lumped in with the eight official planets, he said.
冥王星、厄里斯和许多其他柯伊伯带的天体对于八大行星来说太不同了，无法归为一类，他说。
So Pluto should be a planet, as should Eris and the dwarf planet Ceres (the largest body in the asteroid belt between Mars and Jupiter), as well as many other objects.
这样看来，冥王星应该属于行星，就像厄里斯和矮行星谷神星(火星和木星之间的小行星带里最大的天体)，以及许多其他的物体也应如此。
The answer, the scientists suspect: when Eris comes closer to the sun in its highly elongated orbit, surface ice warms up to form a temporary atmosphere.
科学家们怀疑，它的答案是：在厄里斯在它极为扁长的轨道运行接近太阳时，表面冰变暖而形成了暂时的大气。
In the fray his sons attend him-terror trembling panic and fear-also his sister Eris or discord the mother of strife his daughter enyo ruiner of cities and a retinue of bloodthirsty demons.
随从他奔赴疆场的有他的儿子：恐怖战栗惊慌和畏惧还有他的姐妹不和女神厄里斯(纷争的母亲)女儿毁城女神厄倪俄和一群嗜血成性的魔鬼。
If Pluto's looking for someone - or something - to blame for being drummed out of the planetary corps back in 2006, it need look no further than Eris.
冥王星2006年被从行星兵团中开除，那么它要为此怪罪的话，就非厄里斯星莫数了。
On this date in 2005, astronomers announced the discovery of Eris, a heavenly body slightly larger than Pluto, and called it the 10th planet.
2005年的一天，天文学家宣布发现厄里斯星，一个比冥王星稍大一些的天体，并把它称为第十大行星。
On this date in 2005, astronomers announced the discovery of Eris, a heavenly body slightly larger than Pluto, and called it the 10th planet.
2005年的一天，天文学家宣布发现厄里斯星，一个比冥王星稍大一些的天体，并把它称为第十大行星。
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