I love how Planet 9 went from a Pluto 1930-2006 Never Forget Shirt crazy theory about aliens on earth to be a legitimate topic in science. I’ve heard some scientists think it’s another gas giant that was flung out during the formation of the solar system. I can’t remember the specifics but something about the orbits of the planets suggests. That there must have been another gas giant in the solar system at some point. It has to do with looking at the orbits of dwarf planets and other objects in the Kuiper Belt.
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They are offset in such a Pluto 1930-2006 Never Forget Shirt way that it seems feasible. That they are effectively counterbalanced by a larger object on the opposite side of the Sun. It’s probably not a gas giant, but rather a Super-Earth, 15ish times the mass of Earth. Money would be the hold up. I think if money weren’t an issue then a modern rethinking of a Voyager style satellite could get made to go crazy fast. In like 5 years we may even be able to use a starship to lift up something massive. Imagine a satellite that’s just absolutely huge with like 80% of its weight being. Nothing but nuclear reactors and ion drives.