Student Project . . Make a Moon Crater Jet Propulsion Laboratory https://www.jpl.nasa.gov/ Last Updated: Oct. 11, 2024 Subject Science Time Required 30 - 60 mins Grade Levels 2-8 Look at the Moon. Can you see those circular shapes all across the face of the Moon and the lines extending from them? Those circular shapes are craters and the lines are "ejecta rays" made from material blasted out of the crater. These craters formed when rocks or comets from space smashed into the surface of the Moon.