Final

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Across
  1. 4. the fourth dimension
  2. 7. deals with general Structure
  3. 10. how hot or cold something is
  4. 12. a type of particle
  5. 13. own by antiparticle
  6. 14. metallic element
  7. 15. when gravitational effect starts
Down
  1. 1. amount per unit
  2. 2. expansion of the universe reverse
  3. 3. a type of material to use in space
  4. 5. arrival or coming
  5. 6. how light travels
  6. 8. tiny energy sources
  7. 9. Blue pigment
  8. 11. when universe expands