| A | B |
|---|
| crater | a pit shaped like a bowl |
| meteorite | a chunk of rock or metal that has fallen from space |
| atmosphere | The layer of gases surrounding Earth or another planet |
| astronomer | a scientist who studies objects in space |
| telescope | a device that makes faraway objects look larger |
| gravity | a pull that every object has on every other object |
| star | a ball of hot gases that gives off energy |
| rotation | turning around axis |
| axis | the imaginary line on which an object rotates |
| revolves | To move in a circle or an orbit |
| phases | the changing shapes of the Moon |
| equator | an imaginary line that circles the Earth halfway between two poles |
| seasons | the four parts of the year |
| solar eclipse | The Moon moves directly between the sun and the Earth |
| lunar eclipse | the Moon moves into Earth's shadow |
| constellation | a pattern of stars |
| orbit | the path a planet, moon or other object takes around another |
