Someone needs to find the editor of this article and give him a well-deserved thrashing.
As written, this sounds as if the planetoid was discovered in some solar system, and that solar system was "known as the Kuiper Belt". Nope.
Or that the new planetoid was itself "known as the Kuiper Belt". Uh uh.
Corrected, it should read something like, "discovered a new planetoid in the the region of our solar system known as the Kuiper Belt
Sloppy journalism seems to be a constant in science stories, but it's the least of the problems involved here. I guess these "discoverers" should be awarded the Fidel Castro Prize.