Number one star!

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Across
  1. 4. a distence measured not in time but in length
  2. 5. equivalent to one joule per second and equal to the power in a circuit
  3. 6. The number of occurrences of a repeating event per unit time
  4. 9. How bright the star maybe
  5. 10. Highest point of the wave
  6. 11. ball of gas in space
  7. 13. the heliocentric parallax of a star
Down
  1. 1. Lowest point of the wave
  2. 2. one crest, one trough
  3. 3. gamma rays having a wavelength of 0.001 angstrom to long waves having a wavelength of more than 1 million KM
  4. 5. How fast the wave goes
  5. 7. an illuminating agent or source, as the sun, a lamp, or a beacon.
  6. 8. The brightness of a star
  7. 12. the distance measured between the waves