Rside-TheUniverse-Jaedyn

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Across
  1. 4. he created the laws of planetary motion
  2. 7. a mathematician and astronomer who formulated a model of the universe that placed the sun rather than the earth at its center
  3. 8. when 2 or more atomic nuclei collide while at a high speed and together form a new kind of atomic nucleus
  4. 9. when the moon blocks the sun from the earth
  5. 11. also known as a degenerate dwarf. a stellar remnant composed mostly of electron-degenerate matter
  6. 13. stars that have a lifetime that can range between 50 million to 20 billion years
  7. 18. an early stage in the process of star formation formed from the gas of a giant molecular cloud
  8. 19. bright balls of gas in the sky
  9. 20. the smallest and densest stars known to exist in the universe
  10. 22. an explosion that periodically shines brighter than an entire galaxy
  11. 24. the change in frequency of a wave for an observer moving to the source
  12. 25. the matter that is in the space between the different star systems in a galaxy
Down
  1. 1. places with such a gravitational pull that nothing can escape
  2. 2. when the earth is blocking the sun from the moon
  3. 3. an Italian astronomer who played a major role in the scientific revolution during the renaissance. He improved the telescope
  4. 5. the angle between an objects rotational axis and orbital axis
  5. 6. a telescope that uses infrared light to find celestial bodies
  6. 10. stars that spend many years fusing hydrogen to helium in their cores
  7. 12. is a scattered graph of stars
  8. 14. a small and relatively cool star on the main sequence
  9. 15. an astronomer and writer who wrote many scientific books
  10. 16. a white dwarf that has sufficiently cooled that it no longer emits significant heat or light
  11. 17. an intersteller cloud of dust and oter ionized gases
  12. 21. stars that form like low mass stars except much quicker
  13. 23. a significant pattern of stars