Stars

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Across
  1. 2. the distance travels in one year
  2. 3. the wave with the greatest amount of energy
  3. 7. the 2nd brightest object in our night sky
  4. 9. the actual brightness of an object
  5. 10. scientist that studies stars
  6. 11. the brightest object in our sky
  7. 13. the north star
Down
  1. 1. instrument to study the stars
  2. 2. the brightness of an object
  3. 4. An instrument that spreads light into different wavelengths
  4. 5. patterns of stars
  5. 6. how bright an object appears when seen from Earth
  6. 8. the distance between waves
  7. 12. the wave with the least amount of energy