The putative "Planet Nine" may have tilted the entire solar system, researchers say. computer simulations suggest that the tilt of the eight official planets can be explained by the gravitational influence of Planet Nine "over the 4.5-billion-years-ish lifetime of the solar system,"
My Solar System 2.04 from PhET https://phet.colorado.edu/sims/my-solar-system/my-solar-system_en.html My Solar System is another Free simulation from PhET at CU Boulder. In this Flash sim, students build a solar system and try it out. Planets might hit each other and the sun, or get flung off into space. Your choice of several Preset (canned) solar system setups, or make your own with 1 - 3 planets, moons, etc. Vary their distances from the sun, their mass, position, and velocity.