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In the Solar System's youth, the Sun was surrounded by a rotating disk of gas and dust from which the planets were born. It is believed that a similar gas-and-dust disk surrounded Saturn during its formation, the fact that these newly discovered moons were able to continue orbiting Saturn after their parent moons broke apart indicates that these collisions occurred after the planet formation process was mostly complete and the disks were no longer a factor.
We are very uniform in our sky coverage and can find all types of orbits, yet we seem to only be finding objects with similar types of orbits that are on the same side of the sky, suggesting something is shepherding them into these similar types of orbits, which we believe is Planet X, what makes this result really interesting is that Planet X seems to affect 2015 TG387 the same way as all the other extremely distant Solar System objects. These simulations do not prove that there's another massive planet in our Solar System, but they are further evidence that something big could be out there.
It’s fairly faint. We don’t know its precise orbit yet and we don’t know anything about its chemical composition, we can guess at its size. We don’t know how much light it reflects. If it reflects a lot of light, if it’s very bright, it will be a smaller object. If it’s a darker object and doesn’t reflect much light, it would be much bigger.
Most objects that we know of interact with the planets in some way so the orbits have been disturbed over the past few billion years, whereas this object is so distant that it may not have been disturbed by planets. So its orbit is a pristine orbit from the formation of the original solar system. If we can get its orbit and understand how it formed and how it got there, it will tell us a lot about the formation of our solar system.
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