7 Asteroid 3753 Cruithne - "Co-orbital" with Earth in that crazy "horseshoe" orbit!
6 Diemos - Doomed to crash down to Mars within 50 Ma
5 Pluto and the new giant KBO's - eccentric and inclined orbits way out there
4 Uranus - serenely orbiting the sun, tipped on its side in defiance of all "tidy" models
3 The Gallilean Satellites of Jupiter - a planetary system in miniature and an exquisite natural clock - allowed determination of the speed of light in the pre - electronic era!
2 The Rings of Saturn - most beautiful feature in the solar system
1 Luna - The craziest, largest, most strangely-created satellite of a rocky planet