He also suggested that such an object might also explain the trans-Neptunian object Sedna's peculiar orbit.
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。
2
That's when astronomers turned up a handful of large trans-Neptunian objects that led to the creation of the "dwarf planet" category.
当时科学家们连续发现了不少海王星外的大型星体，继而产生了“矮行星”这一分类。
3
The IAU further resolves that Pluto is a dwarf planet by the above definition and is recognized as the prototype of a new category of Trans-Neptunian Objects.