| A | B |
|---|
| revolution | movement of one body around another |
| Olympus Mons | a volcano found on the planet Mars |
| asteroid | a large chunk of rock traveling through space |
| orbit | the fixed path around an object |
| Kepler | German scientist who stated that the planet's orbits were elliptical |
| Ganymede | the largest satellite in the solar system |
| Ceres | the largest asteroid in the solar system |
| Ptolemy | Egytptian scientist who believed that the planets revolved around the earth |
| Oort Cloud | ice cloud near Pluto where comets originate |
| comet | large chunk of rock,ice,dust,and frozen gases moving through space |
| Copernicus | Polish scientist who said that the planets moved around the sun in circular orbits |
| rotation | the complete turning of a planet on its axis |
