2015 TC387 has the biggest orbit that we know of, but that doesn't mean there aren't more of its kind out there. "I think most astronomers suspect that the Oort Cloud may be full of all kinds of dwarf planets," Alison Earnhart, a Juniata College physics instructor, told Popular Science in an email. There might also be some big ones out there, like Planet X, she wrote. But it's one thing to suspect it and another to observe it, she says. "Goblin is another big step forward in our accumulation of evidence for what is contained in the Oort Cloud, which is still a very mysterious realm because it's just so far away," she says. Earnhart, who was not involved in the current study, says she's excited about the new find.