| A | B |
|---|
| orbit | The closed path of one object in space around another object |
| phase | One of the shapes the moon seems to have as it orbits Earth |
| axis | An imaginary line that runs through the center of Earth from the North Pole to the South Pole |
| rotate | To spin around an axis |
| solar system | A star and all the planets and other objects that revolve around it |
| planet | A large body that revolves around a star |
| comet | A ball of rock, ice, and frozen gases that revolves around the sun |
| revolve | To travel in a closed path |
| sun | The star at the center of our solar system |
| universe | Everything that exists in space |
| constellation | a pattern of stars that form an imaginary picture or design in the sky |
| moon | A natural body that revolves around a planet |
| galaxy | A huge system of gases, dust, and many stars |
| star | A huge ball of superheated gases |
