“Sedna”可以造什么句，Sedna造句

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。

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.