Chp. 20 : The Universe - Key Terms Crossword Puzzle

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Across
  1. 1. A small , hot , dim star that is the leftover center of an old star .
  2. 4. A newborn star .
  3. 5. A gigantic explosion in which a massive star collapses and throws its outer layers into space .
  4. 6. An apparent shift toward shorter wavelengths of light caused when a luminous object moves toward the observer .
  5. 7. Specific elliptical galaxy mentioned on pg. 677
  6. 9. An object so massive and dense that not even light can escape its gravity .
  7. 12. A steady but very dim signal from all over the sky in the form of radiation at microwave wavelengths .
  8. 17. Quasi-stellar radio sources ; very luminous objects that produce energy at a high rate and that are thought to be the most distant objects in the universe .
  9. 18. An apparent shift toward longer wavelengths of light caused when a luminous object moves away from the observer .
  10. 19. A collection of stars , dust , and gas bound together by gravity .
  11. 21. The sum of all space , matter , and energy that exist , that have existed in the past , and that will exist in the future .
Down
  1. 2. The gas and dust located between the stars in a galaxy .
  2. 3. Specific telescope mentioned on pg. 675
  3. 8. A large celestial body that is composed of gas and that emits light ; the sun is a typical star .
  4. 10. A diagonal line in space .
  5. 11. The distance that light travels in one year ; about 9.5 trillion kilometers .
  6. 12. A group of stars or galaxies bound by gravity .
  7. 13. Cluster of galaxies forming even larger groups .
  8. 14. Explosion that expanded the universe and continues to expand the universe everyday .
  9. 15. A star that has collapsed under gravity to the point that the electrons and protons have smashed together to form neutrons .
  10. 16. Undetectable matter in the interstellar medium .
  11. 20. A large cloud of dust and gas in interstellar space .