| Term | Definition |
|---|
| Heavenly bodies | Stars and planets found in the sky |
| Asteroid | A space rock, smaller than a planet which orbits the sun |
| Axis | A straight line around which a body spins or rotates. |
| Black Hole | An object whose gravity is so strong that not even light beams can escape its gravity's pull |
| Comet | A small icy body orbiting the sun which produces a tail of gas and dust when it gets close to the sun |
| Constellation | Stars that seem to form a pattern or shape as seen from the Earth |
| Diffuse | Spread out, with no clear edge |
| Diurnal | Related to actions occuring during a 24hour or daily cycle |
| Eclipse | An event that occurs when the shadow of one object in the solar system crosses another |
| Galaxy | A very large cluster of many stars usually between one billion and 100 billion |
| Gravitational Pull | The force that draws all objects in the universe toward each other. |
| Gravity | The force that help create stars and planets and prevents them from flying apart |
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