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It went on like this. At issue was how many data points they were using in their simulations. Brown had two, but Batygin thought this was wrong, and felt that Brown’s room for error (aka, “the wall”) was too small. While they consider themselves “regular Caltech nerds,” this was also a reference to Game of Thrones, since all the distant Kuiper Belt objects are cold and living “beyond the wall.” Quick, someone holds the door for this fight:

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This type of friendly, extremely nerdy, almost-marital bickering is typical of Brown and Batygin, and maybe even expected from two guys who have spent the past few years recreating the solar system together. They each run simulations that begin at some point in the past 4 billion years. Since we can’t go back in time to see what could have placed Planet Nine where it is or to actually find out where it is, they each recreate the growth of the planets over time.