Chapter 27

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Across
  1. 4. expanding shell of gases shed by a dying star
  2. 8. a cool star that is very bright because of its large surface area that gives off a large amount of light
  3. 10. a graph of the absolute magnitude of a star plotted against their surface temperature or color
  4. 11. type of galaxy with no identifiable shape and an uneven distribution of stars
  5. 13. neutron stars that have two beams of radiation that sweep across space
  6. 14. starlike object that gives off radio waves and xrays
  7. 15. group of hundred of stars with a loose shape
  8. 17. stars in the lower left corner of the HR diagram; hot but dim because of their small size
  9. 18. how bright the star would appear if it were seen from a distance of 32.6 light years
  10. 20. the second stage in the development of a star; the shrinking spinning center region of a nebula
  11. 23. a major grouping of stars on the H-R diagram that forms a narrow band from the upper left to the lower right
  12. 24. large stars that blow apart with a tremendous explosion
  13. 25. white dwarf star that explodes as it cools, temporarily becoming thousands of times brighter
  14. 27. body of gases that gives off tremendous amount of radiant energy in the form of light and heat
  15. 28. the distance light travels in one year
Down
  1. 1. a group of cool, bright stars in the upper right corner of the HR diagram
  2. 2. type of spiral galaxy with a bar of stars that runs through the center
  3. 3. type of galaxy with a center of bright stars and arms that swirl around the center
  4. 5. hole in space with a gravity so great that not even light can escape; formed by the collapse of a large supernova
  5. 6. the brightness of a star as seen from Earth
  6. 7. starts circling the north star
  7. 9. pair of stars that revolve around each other
  8. 12. groups of hundreds of stars in a sphere shape
  9. 13. An apparent shift in the position or direction of an object when viewed from different locations
  10. 16. type of galaxy with a very bright center that contains little dust and gas and is spherical or disk like
  11. 19. spectrum is shifted toward red and wavelengths appear longer
  12. 21. small but dense ball of neutrons caused when the core of a supernova contracts after an explosion
  13. 22. large groups of stars
  14. 25. cloud of dust and gas where stars begin
  15. 26. A pattern of stars in the sky.