| A | B |
|---|
| Ammeter | Measures electrical current |
| Barometer | Measures air pressure |
| Thermometer | Measures temperature |
| Hygrometer | Measures humidity |
| Geiger counter | Measures radiation |
| Micro | Small |
| Macro | Large |
| Asteroid | Rock-like objects between Mars & Jupiter |
| Meteoroid | Chunks of metal or stone orbiting the sun |
| Meteor | Streak of light produced by a burning meteoroid |
| Meteorite | Meteor that strikes the Earth |
| Gravity | Force of attraction between objects |
| Orbit | Path an objects takes when moving around another object in space |
| Rotation | Circular motion on an axis, takes Earth 24hrs. to rotate once on its axis |
| Revolution | Elliptical motion around another object, takes Earth 365 days to revolve around the sun, one year |
| Ion | Electrically charged particle |
| Radiation | Emission of particles from a nuclear |
| Contamination | Dangerous |
| Hazardous | No loner pure or safe |
