第五颗行星非常奇怪，是这些星星中最小的一颗。
The fifth planet was very strange. It was the smallest of all.
同时我们刚刚宣布了发现了第五颗行星，这是在太阳系外发现的第一个拥有5颗行星的类太阳恒星。
And we're just now announcing the discovery of the fifth planet, the first planetary system with five full planets orbiting a sunlike star.
另外一方面，他写到“我们不能证明没有第五颗行星”，还没有人要求他们观测的精确性，以证明这个小型外系行星的缺乏。
On the other hand, "we can't prove there is no fifth planet." No one yet has the required precision in their observations to prove the absence of such a small exoplanet, he notes.
9月29日，一个由位于圣克鲁兹市加州大学的天文学家斯蒂文。沃戈特带领的美国小组宣布它们已经发现了第五颗行星。
On 29 September, a U.S.-based team led by astronomer Steven Vogt of the University of California, Santa Cruz, announced that it had discovered a fifth planet.
这是太阳系第五颗矮行星，与冥王星属同一类别同一区域。
It is the solar system's fifth dwarf planet, in the same category and region as Pluto.
这是太阳系第五颗矮行星，与冥王星属同一类别同一区域。
It is the solar system's fifth dwarf planet, in the same category and region as Pluto.
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