ABSTRACT
This chapter describes about a unit the author taught in third grade on the solar system. Gravity is a measure of an attractive interaction between two bodies determined by mass if the bodies are stationary with respect to each other. The chapter argues that the classroom community is shaped both by the ways that he encourages the children to interact with each other and by what he feel is a genuine engagement the children have with the science. And science, which is a living, growing thing, has people interacting. Rather than divide the class into factions, differences strengthen the need each child feels for another. The encyclopedia talks about how in order to escape the earth's gravity an object has to be moving very fast, at an "escape velocity". The author explores the revolution of one body around another would be a way to start thinking about gravity as a dynamic interaction between two bodies; another version of Dembe's tug-of-war.
