Stellar Evolution and the Universe

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Across
  1. 3. When the core runs out of hydrogen and the star expands and turns red.
  2. 4. Two words, 90% of the stars on the H-R diagram, colored blue, yellow, red and are stable.
  3. 8. Two words, no particular shape and are thought to contain newer stars.
  4. 10. Space and all the mater in it.
  5. 11. Clouds of gas & dust that contracts to form new stars.
  6. 13. Two words, the average distance between the Earth and the Sun.
  7. 14. Two words, new stars form near the arms.
  8. 15. Two words, occur when a sun-like star stops core fusion, ejects its outer layers into space and shrinks to an Earth-sized object.
Down
  1. 1. Two words, the distance light travels through space in one year.
  2. 2. Two words, look like spheres or ovals and are thought to contain older stars.
  3. 5. Two words, super-dense cores of large collapsed stars.
  4. 6. Large collections of stars, gas, and dust held together by gravity.
  5. 7. Two words, end result of very massive stars imploding, where gravity falls inwards forever creating a hole in space-time.
  6. 9. When fusion stops and a supergiant star implodes under its own gravity, then explodes.
  7. 12. Galaxies held together in groups by gravity.