Down
| 2. | The distance light travels in one Earth year. |
| 3. | A red giant that uses almost all of its fuel will begin to collapse into this type of star. At this stage of a star's life cycle the star will give out very little light. (2 words) |
| 5. | All matter and energy that exists including Earth, stars, planets, and dust. |
| 6. | A massive star that uses up all its fuel, rapidly contracts, and explodes. The explosion releases an enormous burst of energy. |
| 7. | A large celestial body that revolves around a star and is larger than an asteroid. |
| 9. | Small chunks of rock that orbit the sun. |
| 10. | A group of stars that form a pattern or shape. Ancient astronomers named these patterns after animals or from Greek mythology. |
| 13. | This occurs when one celestial body passes through the shadow of another celestial body. |
| 14. | An instrument that makes distant objects seem larger. |
| 18. | A small celestial body that orbits the sun. This often has three parts: a nucelus, a coma, and a tail. |
| 20. | Earth's imaginary line that runs from the North Pole through the center of Earth to the South Pole. |
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Across
| 1. | An area of dense, invisible matter in space. The gravitational attraction is so large in this that anything that enters will not escape. (2 words) |
| 4. | A measure of the brightness of a star or another celestial body. |
| 6. | A dark area on the sun that is caused by magnetic storms. |
| 8. | A star may form from this cloud of gas and dust in space. |
| 11. | When a celestial body moves in an orbit around another celestial body. |
| 12. | An instrument used by astronomers to study the light given off by stars. |
| 15. | A group of stars, gas, and dust, such as the Milky Way. |
| 16. | A body, such as the moon, that revolves around a larger body. This may also be an artificial object that was sent into space to orbit another object. |
| 17. | A path that a celestial body takes as it revolves around another celestial body. |
| 19. | Matter from a nebula that has begun to condense under the weight of gravity to begin the formation of a star. |
| 21. | When a planet or other celestial body spins around itself or its axis. |
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