Irp

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Across
  1. 4. sword
  2. 5. 5th planet from the sun
  3. 6. Commander of a fleet or navy squadron
  4. 7. aircraft for stopping hostile aircraft
  5. 11. 3rd planet from the sun
  6. 12. intense beam of monochromatic light
  7. 13. opponent
  8. 15. 1st letter of the greek alphabet
  9. 17. part of an advancing army or naval force.
  10. 18. natural satellite for a planet
  11. 19. quantity of energy
  12. 20. deputy acting for superior
Down
  1. 1. high ranking army officer
  2. 2. vehicle for space travel
  3. 3. interferes or alters something else
  4. 8. radioactive metal
  5. 9. a type of battleship
  6. 10. support
  7. 14. first version of something
  8. 16. ionized gas made of positive ions & electrons