| A | B |
|---|
| comet | loose collections of ice, dust, and small rocky particles |
| coma | fuzzy outer layer of a comet - dust and gas cloud |
| nucleus | solid inner core of a comet |
| Kuiper Belt | doughnut-shaped area that goes beyond Neptune |
| Oort Cloud | spherical (ball) area of comets that surrounds solar system way beyond Pluto |
| asteroid | Large rocky objects flying in space |
| asteroid belt | area between Mars and Jupiter where most asteroids are located |
| meteoroid | chunk of rock or dust in space |
| meteor | meteoroid burning up in Earth's atmosphere |
| meteorite | meteoroid that passes through Earth's atmosphere and hit the Earth or the surviving parts after impact |
