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What are the planets from smallest to largest?

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If we're simply speaking regular planets and not including the dwarf planets, then they are as follows:
Mercury (2,439.7 km), Mars (3,390.0 km), Venus (6,051.8 km), Earth (6,371.0 km), Neptune (24,622 km), Uranus (25,362 km), Saturn (58,232 km), and Jupiter (69,911 km).

If you want to be cool and smart and include the largest dwarf planets and dwarf planet candidates as well, their sizes are are all smaller than Mercury, minus Pluto. They are:
(Potentially) 2007 UK126 (439 km), (Potentially) (202421) 2005 UQ513 (462 km), (Potentially) 90482 Orcus (473 km), (Potentially) 50000 Quaoar (500 km), (Potentially) 2005 QU182 (525 km), (Potentially) (84522) 2002 TC302 (572.7 km), Hamea (575 km), (Potentially) 2007 OR10 (600 km), (Potentially) 90377 Sedna (745 km), Makemake (750 km),Pluto (1,195 km), & Eris (1,300 km).

Of course, this is not all potential planets and dwarf planets. For a full list, check here.

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