| Term | Definition |
|---|
| their atmospheres are massive | One way that gas giants differ from he terrestial planets |
| It period of rotation equals its period of revolution | Why we see the same side of the moon from Earth |
| they help us learn the history of our solar system | Why study smaller bodies such as comets or asteroids? |
| the moon's orbit is tilted | Why don't solar and lunar eclipses occur every month? |
| carbon dioxide | Gas that traps the most hear in Venus' atmosphere. |
| The moon is too far away from Earth to competely hide the sun | Annular solar eclipses occur because ___. |
| small, dense, and rocky | Inner planets are ___. |
| between Earth and the sun | Average distances the astronomical unit is based on. |
| A large body struck Earth | Present theory about the birth of the moon. |
| meteorite | meteoroids that fall to Earth |
| comet | small bodies of ice and cosmic dust |
| Mars and Jupiter | most asteroids in our solar system are found___. |
| rotation | The counterclockwise spin of a planet or moon as seen from above the planet's North Pole |
| retrograde | Venus has a _____ rotation. |
| meteorite | A meteroid is called ___ only after it has sruck Earth's surface. |
| satellites | Natural or arificial bodies that orbit larger celestial bodies such as planets |
| terrestial planets | Inner planets of our solar system. |
| comets | "dirty snowballs" composed of ice, rock, cosmic dust. |
| lunar eclipse | Earth's shadow falls on the moon |
| period f revolution | Amount of time an object takes to orbits around another body once |
| phases | The different appearances of the moon. |
| solar eclipse | When the moon's shadow falls on part of the Earth. |
| comets | frozen bodies made of ice, rock, and dust. |
| asteroids | small, rocky odies that revolve around the sun. |
| meteors | bright streaks of light that result when rocky bodies burn up. |
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