Guh

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Across
  1. 3. Can be seen by the naked eye.
  2. 4. A spectrum of electromagnetic radiation emitted through a substance
  3. 6. 3rd shortest wavelength, 3rd highest frequency.
  4. 7. Longest wavelength, lowest frequency.
  5. 12. Graph in which the absolute magnitudes of stars are plotted against their spectral types
  6. 14. The magnitude of a celestial object as would be seen from 10 parsecs
  7. 16. A star with ssubstantiatelarger radius and luminosity than a main-sequence star
  8. 17. The most massive and luminous stars
  9. 18. 3rd longest wavelength, 3rd lowest frequency.
Down
  1. 1. The range of wavelengths or frequencies
  2. 2. A spectrum of electromagnetic radiation emitted by a source
  3. 5. 2nd shortest wavelength, 2nd highest frequency.
  4. 8. A classification of stars which appear on plots as a continuous band.
  5. 9. 9.4607 x 10 12 km
  6. 10. The magnitude of a celestial object as measured from Earth
  7. 11. Small, very dense stars
  8. 13. Shortest wavelength, highest frequency.
  9. 15. An emission spectrum that consists of a continuum of wavelengths.