Lessons 1-2

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