There are two ways to regard an object's size: its dimensions or its mass. For this list, I have used the radius of each object as the standard...they are all spherical with only slight deviations. But were you to stand on one of them (were that possible), their gravitational pull on you (i.e. your weight) would be determined by their mass. Note that Mercury is smaller (albeit more massive) than two moons while Pluto, once considered to be our ninth planet, is way down on the list at number 17 as a dwarf planet. The Kuiper Belt refers to the region of the solar system extending out from Neptune's orbit about 20 Astronomical Units (1 A.U. = Earth's average distance from the Sun). And should humanity ever figure out its social hang-ups here on Earth and finally begin an earnest effort to travel and eventually settle beyond our home planet, the Kuiper Belt will be an area of immense interest. Thanks to Wikipedia for providing much of the information I used here...
1 SUN Star
2 JUPITER Planet
3 SATURN Planet
4 URANUS Planet
5 NEPTUNE Planet
6 EARTH Planet
7 VENUS Planet
8 MARS Planet
9 GANYMEDE Moon of Jupiter
10 TITAN Moon of Saturn
11 MERCURY Planet
12 CALLISTO Moon of Jupiter
13 IO Moon of Jupiter
14 MOON (LUNA) Moon of Earth
15 EUROPA Moon of Jupiter
16 TRITON Moon of Neptune
17 PLUTO Dwarf Planet in Kuiper Belt
18 ERIS Dwarf Planet beyond Kuiper Belt
19 HAUMEA Dwarf Planet in Kuiper Belt
20 TITANIA Moon of Uranus
21 2007 OR10 Dwarf Planet beyond Kuiper Belt
22 RHEA Moon of Saturn
23 OBERON Moon of Uranus
24 IAPETUS Moon of Saturn
25 MAKEMAKE Dwarf Planet in Kuiper Belt
26 CHARON Moon of Pluto in Kuiper Belt
27 UMBRIEL Moon of Uranus
28 ARIEL Moon of Uranus
29 DIONE Moon of Saturn
30 QUAOAR Dwarf Planet in Kuiper Belt
31 TETHYS Moon of Saturn
32 SEDNA Dwarf Planet beyond Kuiper Belt
33 CERES Dwarf Planet, largest and only spherical asteroid
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