My Puzzle

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Across
  1. 4. closest star system to our planet
  2. 5. optical system that combines refractor and reflector techniques
  3. 7. calf, scepter, crown
  4. 9. 12 who closely followed Jesus
  5. 10. usually indicated with a red asterisk
  6. 11. measurement of acidity levels (abbr.)
Down
  1. 1. earth’s only natural satellite
  2. 2. 6 stringed instrument
  3. 3. largest planet in the solar system
  4. 6. optical tool to see things far away in greater detail
  5. 8. common type of professional camera (abbr.)