| A | B |
|---|
| Geocentric | earth centered |
| Heliocentric | sun centered |
| 1ST scientist to use a telescope | Galileo |
| Ellips | an oval orbit of each planet |
| What keeps the planets in orbit? | inertia and gravity |
| inertia | tendancy of an object to continue in a straight line |
| Who discovered that the orbits of planets are ellipses? | Kepler |
| Who thought the sun to be the center of the planets? | Copernicus |
| Where does the sun's energy come from? | Nuclear fusion |
| Photoshpere, chromoshere, and corona are what? | The layers of the sun's atmoshere |
| The inner layer of the sun is called | photosphere |
| The middle layer of the sun | chromosphere |
| The outer layer is called the | corona |
| solar wind | electricaly charged particles sent out by the corona |
| During what event can you see the sun's corona? | ellipses |
| sunspots | dark spots on the sun made by gases that are cooler than those around them |
| Prominences | a huge looping eruption of gas from the chromoshere |
| What is the source of light that reaches the Earth from the sun? | The photoshere |
| What is the Solar wind? | It is a steam of electrically charged particles sent out into space from the corona. |
| A loop of gas that links groups of sunspots. | prominence |
| What are the terrestrial planets? | Mercury, Venus, Earth, Mars |
| What four planets are made up of mostly gases? | Jupiter, Saturn, Uranus, Neptune |
| Chunks of dust and ice that usually have long, elliptical orbits. | Comets |
| Which planet is both one of the hottest and coldest? | Mercury |
| Trapping of heat by the atmoshere is called? | The greenhouse effect |
| Which planet never has a sunny day? | Venus |
| This planet is called the "red planet" | Mars |
| This planet has two moons | Mars |
