| A | B |
|---|
| star | a ball of hot gases that gives off light and other forms of energy |
| planet | a large body in space that moves around a star |
| orbit | the path an object moves in around another object |
| rotation | turning on an axis |
| revolution | the movement of an object around another object |
| galaxy | a very large group of stars |
| universe | everything that makes up outer space |
| phases | the different ways the moon looks throughout the month |
| satellite | a man-made object that orbits the Earth |
| moon | a small, rounded body in orbit around a planet |
| constellation | a group of stars that form a pattern |
| telescope | a tool that makes distant objects appear larger, brighter, & sharper |
| relative size | the size of an object compared to similar objects |
| relative order | the general sequence of the planets according to their distance from the Sun |
| axis | an imaginary line through the center of an object |
