A meteor is a huge rock like substance that fly from the sky. There are as many as a dozen a day that hit the Earth. Most hit the water and their not always big. One medium sized one hit the earth and created a huge hole in the ground that could almost fit SLO. A meteor shower happens when earth a region of a higher concentration of meteoroids. A meteor shower is  A large number of meteors that appear together and seem to come from the same area in the sky.