| A | B |
|---|
| Asteroid | a small, rocky body that orbits the Sun; a large asteroid belt lies between Mars and Jupiter |
| Comet | an object that orbits the Sun; made of frozen water and dust, and has a tail of gas and dust particles that points away from the Sun |
| Gravity | force of attraction between two objects due to their masses |
| Meteor | a small piece of matter from outer space that becomes a streak of light when it falls through the Earth’s atmosphere and burns up; also known as a falling or shooting star |
| Orbit | the path that one object in space follows as it revolves around another object in space |
| Revolve | one complete orbit made by a planet or satellite around another object |
| Rotate | the spinning of an object on its axis |
| Surface gravity | the force of gravity at the surface of the Earth or other celestial body |
