Our solar system keeps getting more interesting as unmanned probes and advances in observational technology advance. It was just announced this week that a new object with a "weird" orbit has been discovered just beyond Neptune. The new 200 kilometer in diameter mini-world has been dubbed "Niku", which is Chinese for rebellious. It got this nickname because it's orbit is highly unusual and has yet to be explained using the usual ideas of how other objects usually orbit the sun. See the link below for more details.