A Star is Born!

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Across
  1. 2. Adjective meaning "of the stars"
  2. 6. Milky Way
  3. 9. Type of light with longer wavelengths than those of visible light
  4. 10. Closest stellar nursery to Earth
  5. 11. Scientific observer of the stars
  6. 12. Most abundant element in the universe
  7. 14. Stellar wind
  8. 15. Ratio of the speed of an object to the speed of sound (SOFIA travels at 0.85)
Down
  1. 1. Region of the upper atmosphere where the SOFIA flies
  2. 3. Airplane pilot
  3. 4. The SOFIA is a 747SP model made by this aerospace company
  4. 5. Dying star
  5. 7. Force by which a planet or other body draws objects toward its center
  6. 8. Optical instrument for making distant objects appear larger
  7. 13. Cloud of interstellar gas