| A | B |
|---|
| Solar Eclipse | seen during the day, shadow of moon falls on Earth |
| Lunar Eclipse | seen only at night, Earth's shadow falls on moon |
| Axis | imaginary line passes through center of planet |
| Rotation | turning of a planet on its axis |
| Revolution | movement of a planet around the sun |
| Comets | made of ice, dust, and gases-orbit the sun |
| Satellite | small body, or moon orbiting a planet |
| Asteroid Belt | forms division between inner & outer planets |
| 365 days | Earth's period of revolution |
| 24 hours | Earth's period of rotation |
| Equinoxes | daylight & darkness are nearly equal |
| AU | avg. distance between Earth & sun |
| Waxing Phases | illumination is gaining |
| Waning Phases | illumination is decreasing |
| Gamma Rays | shortest wavelength |
| Radio Waves | longest wavelength |
| X-Rays | given off by hot stars |
| Galileo | made first refracting telescope |
| Newton | invented the reflecting telescope |
| White light | combination of all the colors of the spectrum |
| Nucleur Fusion | energy emitted by the sun |
| Mars | atmosphere= carbon dioxide & nitrogen |
| Penumbra | partial shadow zone |
| Umbra | complete shadow zone |
| Asteroids | rocky bodies orbit between Mars & Jupiter |
| Inner Planets | Mercury, Venus, Earth & Mars |
| Outer Planets | Jupiter Saturn Uranus Neptune Pluto |
| Neap Tide | occur twice a month, moon & sun at right angles |
| Spring Tides | occur twice a month, sun & moon in straight line with Earth |
