So… If you’re a teacher, camp counselor, etc. and looking for an educational outdoor activity, you might try this: How to build the Solar System This version is sometimes called the Thousand Yard (or “peppercorn”) Solar system. It utilizes familiar “household” objects - which makes the thing both easier to build and more memorable. Most importantly (and impressively) this model is to scale in both size and distance. Relative sizes Your “Sun” needs to be about 8” (20cm) in diameter. A volleyball (or an appropriately sized cantaloupe) would do the trick. The “planets” are next. Mercury = the head of a pin Venus = a peppercorn Earth = a peppercorn Mars = the head of a pin Jupiter = a walnut Saturn = an acorn Uranus = a coffee bean Neptune = a coffee bean Pluto (optional, former planet) = a grain of salt Since these items are quite small, it’s probably best to tape/impale them to index cards. The cards, in turn, can be stapled to sticks to look like flags. Relative distances These numbers are based on yards. So you’d need to do some minor conversions for meters. But as a practical matter, you can get away with just pacing out (/w long steps) the distances. First, find a field. (Turns out, you need a lot of “space” to make a star system ). Next, place the “Sun” at one end. Finally, you set up the “planets.” Mercury = from the Sun, walk 10 paces and plant your Mercury flag. Venus = from there, walk 9 more paces (19 total) Earth = 7 more paces (26 total) Mars = 13 more paces (39 total) Jupiter = 95 more paces (134 total) Saturn = 113 more paces (247 total) Uranus = 249 more paces (497 total) Neptune = 281 more paces (777 total) Pluto = 237 more paces (1014 total) Your Solar system is now complete! Very big as models go - but, obviously, only a tiny fraction of the real thing. (The scale is about 1:6,000,000,000.) Also keep in mind that these approximate orbital distances only define the radius of the Solar system; the diameter would be twice as big. Finally, you could explore interstellar distances based on this scale by setting up a model of the Alpha Centauri system - the closest star system to the Sun. But you’d need place this model some 4000 miles away.