New Frontiers

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Across
  1. 3. the area behind the main object of contemplation
  2. 6. a unit of linear measurement of magnifying power
  3. 9. a possibility of something happening
  4. 10. the state of position of being a leader
  5. 12. an expert in or student of astronomy
  6. 14. fluctuating or restricted according to the season or time
  7. 15. a low area of land between hills or mountains
Down
  1. 1. sapace with a building structure to be used living
  2. 2. very small solid particle
  3. 4. a thing that is needed or wanted
  4. 5. make a cause to make progress
  5. 7. not having or needing a crew or staff
  6. 8. is the academic title or academic degree
  7. 11. desire or be curious to know something
  8. 13. a very great extent or quantity immense