Sedna

Is Sedna a planet?

赛德娜是行星吗？

A recently-discovered dwarf planet, named Sedna, has an extra-long and usual elliptical orbit around the Sun.

一颗近期被发现的褐矮星“赛德娜”(Sedna)有一个超长的椭圆形的绕太阳的轨道。

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。

Perhaps a massive unseen object is responsible for Sedna´s mystifying orbit, its gravitational influence keeping Sedna fixed in that far-distant portion of space.

也许一颗大质量的未被观测到的天体应该对“赛德娜”那令人迷惑的轨道负责。它的引力影响让“赛德娜”固定在遥远星空中的那个位置上。

Since no images of Makemake´s surface yet exist, an artist´s illustration originally meant to depict Sedna has been boldly co-opted above to now illustrate Makemake.

目前仍没有鸟神星表面的照片，因此上面这张原本用来描绘赛德娜的艺术家想像图便直接拿来描绘鸟神星。