Science vocab.

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Across
  1. 3. An object whose gravity is so great light cant escape
  2. 5. Made of gas, dust, and ice
  3. 11. A shell of cooler hydrogen above a stars core
  4. 12. The apparent surface of star
  5. 13. Small, rocky particle that moves through space
  6. 14. A celestial body moving in an elliptical orbit around a star
  7. 15. Huge collection of stars
Down
  1. 1. The wide outermost layer of the Sun's atmosphere
  2. 2. A meteor that strikes Earth
  3. 4. Small rocky objects
  4. 6. Region of strong magnetic activity
  5. 7. Emits no light at any wavelength
  6. 8. A cloud of dust and gas
  7. 9. A shift of a different wavelength
  8. 10. Has spiral arms that begin at a central disk