| Term | Definition |
|---|
| Geocentric System | Earth is at the center of the revolving planets and stars. |
| Heliocentric System | Earth and the other planets revolve around the sun. |
| Ellipse | An oval shape, which may be elongated or nearly circular. |
| The core | Where the sun produces an enormous amount of energy. |
| Nuclear Fusion | Hydrogen atoms join together to form helium. ________ _______ only occurs under conditions of extremely high temperatures and pressure. |
| Radiation Zone | A region of very tightly packed gas where energy is transformed mainly in the form of electromagnetic radiation. |
| Convection Zone | The outermost area of the sun's interior. |
| The Photosphere | The inner layer of the sun's atmosphere. |
| The photosphere, the chromosphere, and the corona. | The Sun's atmosphere |
| The Chromosphere | The glow from the middle layer of the sun's atmosphere. |
| The Corona | The outer layer |
| Sunspots | Areas of gas on the sun's surface that are cooler than the gases around them. |
| Prominences | Huge, reddish loops of gas. |
| Solar Flares | The energy heats gas on the sun to millions of degrees Celsius, causing the gas to erupt into space. |
| Mercury, Venus, Earth, Mars | Four Inner Planets (in order from distance to the sun, closest to farthest) |
| The core, the radiation zone, the convection zone | List 3 Layers of the Sun's Interior |
| Earth | Liquid water at its surface |
| Earth | 70% water |
| Earth | Enough gravity to hold on to most gases |
| Mercury | Smallest terrestrial planet |
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