Solar System lie within a nearly flat disc called the ecliptic. The Solar System also contains smaller objects. The asteroid belt, which lies between the orbits of Mars and Jupiter, mostly contains objects composed, like the terrestrial planets, of rock and metal. Beyond Neptune's orbit lie the Kuiper belt and scattered disc, which are populations of trans-Neptunian objects composed mostly of ices, and beyond them a newly discovered population of sednoids. Within these populations are several dozen to possibly tens of thousands of objects large enough that they have been rounded by their own gravity. Such objects are categorized as dwarf planets.
The Magic School Bus Lost in the Solar System The Magic School Bus Lost in the Solar System The Magic School Bus Lost in the Solar System is the fourth book in Joanna Cole and Bruce Degen's "The Magic School Bus" series. The book depicts arguably the most well-known adventure of the series and introduces the character of Janet. Ms. Frizzle's class is learning about the solar system and Arnold's unpleasant cousin Janet, who constantly raves about herself, has joined them. The Friz decides to take the kids on a field trip to the planetarium, but, once they get there, they find the planetarium is closed. However, on the