他认为，这样的一颗天体也许还能够解释外海王星天体赛德娜的奇特轨道。
He also suggested that such an object might also explain the trans-Neptunian object Sedna's peculiar orbit.
厄里斯和许多其他在海王星轨道绕着太阳转动的天体，又该不该是行星呢？
Should Eris, and many other objects circling the sun beyond Neptune's orbit?
而且冥王星虽小，却被认为比海王星轨道之外的任何天体都大。
Pluto is tiny, but it was considered larger than anything else past the orbit of Neptune.
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