Gavin Kahn's Vocabulary Crossword

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Across
  1. 2. Distance light travels in one year
  2. 4. Average distance from Earth to the Sun
  3. 6. step-by-step way to test scientific ideas
  4. 9. The circular path a planet takes around the sun
  5. 10. an exert of energy
  6. 11. atoms joining to make energy in a star
  7. 13. neutral particle in an atom's nucleus
  8. 15. How bright a star looks from Earth
Down
  1. 1. negative particle outside an atom's nucleus
  2. 3. Real brightness of a star from a set distance
  3. 5. Total energy a star gives off each second(brightness)
  4. 7. All space we can see from Earth
  5. 8. positive particle in an atom's nucleus
  6. 12. Distance unit equal to about 3.26 light-years
  7. 14. invisible force pulling us down
  8. 15. building block of matter