The Life Of Stars

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Across
  1. 3. a small very dense star that is typically the size of a planet. It is formed when a low-mass star has exhausted all its central nuclear fuel and lost its outer layers as a planetary nebula
  2. 5. Any star which is larger than 8 solar masses during its regular main sequence lifetime
  3. 6. a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass
  4. 8. the nebulosity surrounding a star
  5. 9. a very large star of high luminosity and low surface temperature. They are thought to be in a late stage of evolution when no hydrogen remains in the core to fuel nuclear fusion
  6. 10. aging giant star which has consumed its core's supply of hydrogen fuel. Helium has accumulated in the core, and hydrogen is now undergoing nuclear fusion
  7. 11. about the size of our sun
Down
  1. 1. a region of space having a gravitational field so intense that no matter or radiation can escape
  2. 2. a celestial object of very small radius (typically 18 miles/30 km) and very high density, composed predominantly of closely packed neutrons
  3. 4. a ring-shaped nebula formed by an expanding shell of gas around an aging star
  4. 7. the star within our solar system that gives life on earth
  5. 12. any luminous object in the sky is massive and remote