Space terms!

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Across
  1. 2. A distinct luminescent part of interstellar medium
  2. 4. An alternative name for the universe
  3. 6. Particles that do not absorb, reflect, or emit light
  4. 10. A solid piece of debris from any object
  5. 13. A ocky, airless remnant
  6. 14. An extremely luminous active galactic nucleus
  7. 15. A global navigation satellite system
  8. 16. A unit of length equal to exactly 9,460,730,472,580.8 km
Down
  1. 1. The brightest and largest object in our night sky
  2. 3. The uppermost layer of our atmosphere
  3. 5. A sphere of gas held together by its own gravity
  4. 7. a powerful and luminous explosion of a star
  5. 8. A type of elementary particle and a fundamental constituent of matter
  6. 9. A celestial body that appears as a fuzzy head
  7. 11. One of the components of iron meteorites
  8. 12. A moon of Jupiter
  9. 13. A collective term referring to the atmosphere and outer space