sedna

Well, what you said about Pluto is true, but you left out super-distant object is only found recently, such as Sedna.

关于冥王星你所说的是对的，但是你忽视了超远距离的物体是最近才发现的，比如塞德娜。

But polar bears Sedna and Nanook have been forced inland by global warming.

这个讯息不但是电影《明日之后》的桥段,也在现实中被全球研究学者不断重申.

But Sedna may have a moon of its own, and if it were a lot closer, we might have called it a planet long ago.

但是塞德娜也许有其自己的卫星，而且如果它能离得更近，我们也许很久以前就称其为行星了。

Sadly for Sedna, though, it's way out there-about eight billion miles away.

然而遗憾的是，它离得很远，约有80亿英里远。

And if so, why not Quaoar and Sedna, and several other worlds, which were smaller than Pluto, but not by much?

而且如果这样的话，为什么夸欧尔、塞德娜及其它星体不是呢？它们比冥王星小些，但没小那多。

Come back in half a billion years, Dr. Brown said, and Sedna will be back in the Kuiper belt, while other Kuiper belt objects will have been pushed into elliptical orbits.

巴蒂金表示，五亿年后赛德娜会回到柯伊伯带，而其他天体也会被推入椭圆形轨道中。

Sedna is already fascinating folks, though, because it is very reflective and reddish colored, confusing astronomers as to what it might be made of.

然而，塞德娜已经让很多人着迷了，因为它能反射太阳光呈微红色，使得天文学家们困惑它到底是由什么组成的。

No one could convincingly explain how the object, which Dr. Brown named Sedna, got there, and the hope was that the discovery of more Sedna-like worlds would provide enlightening clues.

布朗把它命名为赛德娜（Sedna）。没有人能够对这颗天体为何出现在那里作出令人信服的解释。科学家希望，将来发现更多的类似天体，从而提供能带来启发的线索。

Sedna's been dubbed a "planetoid"-think of it as a mini-planet, three quarters as big as Pluto. It's smaller than our moon.

塞德娜被称为“小行星”，其体积大小为冥王星的四分之三，比月球小一点。

Sedna is so distant, and tiny, that it was only discovered for the first time this year by astronomers at the California Institute of Technology in Pasadena.

由于塞德娜那么远又那么小，因此帕萨迪纳市加州理工学院的天文学家们于今年第一次发现它。