Across
- 7. how to measure in space
- 9. energy that travels in waves
- 11. round and orbits the sun
- 13. loose balls of ice and rock
- 15. natural satellite
Down
- 1. smaller than asteroids
- 2. to say something nice
- 3. unique to a certain planet
- 4. small rocks
- 5. consists of the sun,the planets,and the moon
- 6. light you can see
- 8. the distance between the crest of one wave to the next
- 10. tools that collect and focus light
- 12. shows the different levels of light
- 14. our star