| A | B |
|---|
| geocentric | Earth centered model |
| heliocentric | Sun centered modeld |
| ellipse | shape of the planets' orbit; an oval |
| Copernicus | proposed the heliocentric model |
| Galileo | used a telescope to provide evidence that supports the heliocentric model |
| Kepler | proved that the orbit of the planets is elliptical |
| core` | center of the sun; where nuclear fission occurs |
| nuclear fission | the conversion of hydrogen atoms into helium atoms releasing a great deal of electromagnetic radiation |
| radiation zone | the middle layer of the Sun's interior |
| convection zone | outermost layer of the Sun's interior |
| photosphere | inner layer of the Sun's atmospere; part you see when you look at the sun |
| chromosphere | middle layer of the sun's atmosphere; glows red during a solar eclipse |
| corona | outer layer of the sun's atmosphere; looks like a halo during a solar eclipse |
| solar wind | electrically charged particles extending into space from the corona |
| sunspots | dark spots on the surface of the sun which are cooler than the rest of the surface; occur in 11 year periods |
| prominence | loops of gas erupting through the chromosphere |
