| A | B |
|---|
| crater | a bowl shaped pit |
| meteorites | a chunk of rock or metal that has fallen from space |
| atmosphere | the layer of gases surrounding Earth or another planet |
| telescope | an instrument that makes distant objects appear nearer and larger |
| gravity | a force that pulls two or more objects toward each other |
| star | a ball of very hot gases that gives off light and other kinds of energy |
| rotation | turning around an axis |
| axis | the imaginary line on which an object rotates |
| revolves | to move in a circle or orbit |
| orbit | the path a planet, moon or other objects takes around another |
| constellation | a group of stars that form a pattern that looks like a person, animal, or object |
| phases | any stage in the series of changes in the apparent shape of the moon |
| equator | an imaginary line that circles Earth halfway between the two poles |
| seasons | any of the four parts of the year |
