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In our solar system the outermost planet 'til March 1999 was considered the same as the outermost planet after March 1999 - it was Pluto. In 2006, the IAU reclassified Pluto as a minor or dwarf planet and no longer a true planet - this demotion meaning Neptune would thereafter be considered the outermost planet in our solar system.

It is of course possible there is a planet out there not yet discovered, which is in solar orbit, and large enough, in which case its distance might qualify it as 'outermost'.

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11y ago

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Why do peoplel say Pluto isn't planet?

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What season can you see Pluto?

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