| A | B |
|---|
| asteroid belt | regions between the orbits of Mars and Jupiter in which most asteriods are found |
| Ceres | largest asteriod 1,000km in diameter |
| asteriod (carbon material) | dark appearance |
| asteriod (iron and nickel) | metallic appearance |
| asteriod (silicate-most common) | look like ordinary earth rocks |
| Trojan asteriods and earth-grazers | asteroids not in the asteriod belt |
| comets | orbit the sun in long ellipses |
| Coments are made of | dust, methane, ammonia and ice |
| Composition of asteriods | no. book only suggest all are the same |
| Oort cloud | a spherical clould of dust and ice that contains nuclei of many comets |
| meteroids | smaller bits of rock or metal throughout the solar system |
| meteor | bright streak of light often called a shooting star |
| fireball | meteroids when vaporizes create a brilliant flash |
| meteor shower | large number of small meteoroids entering earths orbit-atomosphere |
| meteorite | a meteoroid or any part of that is left when it hits earth |
| iron meteorites | easier to find due to stony appearance looks like ordinary earth rocks |
| stony-iron meteorites | contains both iron and stone and are very rare |
| stony meteorites | similar in composition to the rocks found on earth and contain carbon substances |
| coma | a spherical cloud of gass and dust surrounds the nucleus |
| Mars and Jupiter | orbits the asteriod belt |
| Away from the Sun | direction the tail of a comet point regardles of what direction comet is traveling |
