Vivienne crossword puzzle

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Across
  1. 3. a unit of distance it equals about 3.26 light years
  2. 5. universe a sphere of space centered on earth
  3. 10. natural physical force that pulls objects toward each others
  4. 11. Fusion a reaction where two light atomic nuclei are combined
  5. 12. magnitude the measure of the true brightness of a star or space object
  6. 13. a negative charge subatomic particle
Down
  1. 1. method step-by-step process used to explore observations
  2. 2. magnitude a measure of how bright other objects look in a sky
  3. 4. a push or pull upon an object
  4. 6. the total amount of radiant energy emitted by a star or celestial body per unit of time
  5. 7. a tiny positive subatomic particle
  6. 8. a neutral charge subatomic particle
  7. 9. curved path that an object takes around in space
  8. 12. basic building block of life
  9. 14. year a unit of distance, not time in space