The Universe

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Across
  1. 4. Crown of the sun
  2. 6. A reddish gaseous layer immediately above the photosphere
  3. 8. A celestial object of very small radius and very high density
  4. 11. A massive burst of solar wind
  5. 14. A fixed luminous point in the night sky
  6. 15. A star increasing brightness
  7. 16. A cloud of gas and dust in outer space, visible in the night sky
  8. 17. A very large star that is even brighter than a giant
  9. 19. A small very dense star that is typically the size of a planet
Down
  1. 1. A gravitational field so intense that no matter or radiation can escape
  2. 2. Innermost layer of the sun
  3. 3. A very large star of high luminosity and low surface temperature
  4. 4. Energy is transported by convection
  5. 5. A celestial object, thought to be a rapidly rotating neutron star
  6. 7. A ring-shaped nebula formed by an expanding shell of gas
  7. 9. A spot or patch on the sun
  8. 10. The luminous envelope of a star
  9. 12. Energy travels through the zone in the form of electromagnetic radiation
  10. 13. A brief eruption of high energy radiation from the suns surface
  11. 18. A star showing a sudden large increase in brightness then returning to its normal state