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Solar System
| Term | Definition |
|---|---|
| Solar System | Consists of the sun,planets, their moons,meteors,asteroids and comets. |
| Milky Way Galaxy | The galaxy in which our solar system is located. |
| Gravity | The force that pulls two objects together; it pulls us toward earth and it keeps the planets in motion around the sun. The attractive force between two objects; its magnitude depends on their masses and the distance between them. |
| Astronomy | The study of the moon,stars and other objects in space. |
| Axis | An imaginary line that passes through Earth's center and the north and south poles, about which Earth rotates. |
| Rotation | The spinning motion of a planet about its axis. |
| Revolution | The movement of an object(planets revolve around the sun;moons revolve around their planets. |
| Orbit | The path of an object as it revolves around another object in space |
| Tides | The daily rise and fall of Earth's waters on shores. |
| Satellite | Any object that revolves around another object. |
| Phase | One of the different shapes of the moon as seen from earth. |
| Crater | A round pit on the moon's surface. |
| Maria | Dark,flat regions on the moon's surface. |
| Core | The central part of the sun, where nuclear fusion occurs. |
| Comet | (dirty snowball) a ball of ice and dust whose orbit is usually a long,narrow ellipse; it has a "glowing tail" up to 100 million miles long. |
| Asteroids | (minor planets or planetoids): objects revolving around the sun that are too small and too numerous to be considered planets. |
| Asteroid Belt | The region of the solar system between the orbits of mars and jupiter, where many asteroids are found. |
| Meteroid | A chunk of rock or dust in space. |
| Meteor | (shooting start): a streak of light in the sky produced by the burning of a meteroid in Earth's atmosphere. |
| Meteorite | A meteroid that has hit Earth's surface. |
| Space station | A man made laboratory orbiting the Earth. |
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