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In our solar system, we know of only the four dwarf planets beyond Neptune: Pluto, Haumea, Makemake, and Eris. There may be more, but we don't know. The Kuiper belt begins at about the orbit of Neptune, and there is a lot of material in it to construct a planet. What other planetary bodies may lie out there other than the two dwarf planets is not known.

Beyond them, there is definitely something, the mythical "tenth planet," which completes an orbit of the sun approximately every 40,000 years. The most believable explanation is that it is not a planet, but a brown dwarf star which would make our star system binary if proven. Stars come in all sizes, shapes, and colors, and they are not fickle about other stars they bond with. In the late 1990s or early 2000s, proof of planets around other stars was obtained, but we know little about them at present.

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