UNIVERSECOMETSComets are often referred to as “dirty snowballs.” They are left over from the formation of stars and planets billions of years ago. Before…Mar 3, 2017Mar 3, 2017
UNIVERSESOLAR SYSTEMThe solar system consists of a central star, the Sun, and all of the smaller celestial bodies that continuously travel around it. The…Mar 2, 2017Mar 2, 2017