| A | B |
|---|
| Jovian | The giant gas ball planets. |
| Star trails | Left on a time exposed night photo due to Earth rotation. |
| Fusion | Lighter elements joining to form heavier elements in the cores of stars. |
| Moon phases | Caused by Moon relvolving around the Earth each month. |
| Apparent diameter | How big an object appears in the sky. |
| Eccentricity | The flatness of an ellipse. |
| Solar eclipse | When the Earth gets in the Moon's shadow, causing the Sun to appear to go out. |
| Heliocentric | Model with Sun in center of solar system. |
| Revolution | Orbiting around something. |
| Rotation | Spinning on an axis. |
| Red shift | Spectral proof of the big bang theory. |
| Main sequence | Where most stars are found on the star graph. |
| Luminosity | The brightness of a star. |
