| A | B |
|---|
| Ptolemy | Greek philosopher who taught that the Earth was the center of the universe and that the sun and other planets revolved around it |
| Aristotle | A Greek philosopher who taught that everything in the solar system was circular because the circle was the "perfect" shape |
| Nicolaus Copernicus | A Polish mathematician who said that the SUN was the center of the universe...NOT THE EARTH! |
| Galileo Galilei | Developed the telescope so that we could see the surface of the moon AND he discovered that Jupiter had four moons |
| Geocentric System | Where Earth is at the center of the revolving planets |
| Heliocentric System | Where the Sun is at the center of the revolving planets |
| Isaac Newton | Said that two factors (inertia & gravity) combine to keep the planets in orbit |
| Comets | Chunks of ice and dust that orbit the sun (only seen briefly) |
| Asteroids | Objects revolving around the sun that are too small and numerous to be considered planets |
| Asteroid Belt | An area between Mars & Jupiter where most asteroids are found |
| Meteoroid | Chunk of rock or dust in space that usually come from asteroids or comets |
| Meteor | The light you see when a meteoroid burns up entering the Earth's atmosphere |
| Meteorite | A meteoroid that passes through the atmosphere and hits the Earth's surface (looks like stones) |
