STAR FORMATION AND EVOLUTION

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Across
  1. 1. A star that has exhausted its nuclear fuel and has expanded to a large size
  2. 4. The outermost layer of a star's atmosphere, visible during a total solar eclipse
  3. 5. A star that has exhausted most of its nuclear fuel and has collapsed to a very small size
  4. 7. The process by which a star exhausts its nuclear fuel, expels its outer layers, and becomes a dense, compact object
  5. 9. A type of star that is extremely hot and bright
  6. 11. A star that is in the process of fusing hydrogen into helium in its core
  7. 13. A star that is smaller and less luminous than the Sun
  8. 14. The lifespan of a star depends on its
  9. 15. The point in the formation of a star at which it becomes hot enough to begin fusing hydrogen into helium in its core
Down
  1. 2. A spherical region around a black hole where the gravity is so strong that nothing, not even light, can escape
  2. 3. The remnant of a massive star that has collapsed to an extremely small volume and has an incredibly strong gravitational field
  3. 6. The process by which a star converts hydrogen into helium in its core
  4. 8. A type of star that is very massive and extremely bright, but has a relatively short lifespan
  5. 10. The measure of a star's brightness as it appears from Earth
  6. 12. The process of a star's core fusing lighter elements into heavier ones