| A | B |
|---|
| Ptolemy | Eqyptian-born astronomer who lived at the height of the Roman Empire |
| Nicolaus Copernicus | Polish mathematician who believed and proposed a sun-centered universe. |
| Johannes Kepler | German mathematician who used mathematical formulas to show that planets move in oval orbits. |
| Galileo Galilei | Italian scientist who proved the theory of a sun-centered universe. |
| Francis Bacon | developed the scientific method |
| Rene Descartes | French mathematician who started with only one truth. He declared: "I think, therefore I am." |
| Issac Newton | He used reason and the scientific method to make many important discoveries. He is best known with his theory about the law of gravity. |
| revolution | sweeping change |
| geogentric | earth-centered universe |
| astronomers | sceintists who study the motions of stars and planets |
| heliocentric | sun-centered universe |
| excommunication | to be exiled, or thrown out, of a church or group |
| ellipses | oval orbits |
| heresy | anti-Church teachings |
| scientific method | method used to test theories and do experiments. Their are steps and is used today in experiments. |
| hypothesis | explanation of the data |
| rationalism | this states that all knowledge is based on reason |
