Unit 4 Active Review

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Across
  1. 3. nebula gases pull together but not dense or hot enough for fusion
  2. 5. Jovian planets are massive but have ______.
  3. 8. infant stage of star life; made of gas and dust
  4. 11. an abundance of these supports a relatively younger universe
  5. 15. terrestrial planets have _____ but are not massive
  6. 17. implosion to explosion event of an older massive star
  7. 18. older star fusing helium to carbon; outer shell expands and star cools
  8. 19. the outward force that expands a star's size
  9. 21. gas giant plantets such as Jupiter and Saturn
  10. 22. leftover after space debris successfully impacts a planet's surface
  11. 23. older theory of an unchanging universe
  12. 24. the "echo" of the big bang
  13. 26. galaxies moving away from each other supports space itself expanding
  14. 27. gases left behind from the remnant of a red giant star; often surround whit dwarf
  15. 28. more massive older star fusing helium to much heavier elements
Down
  1. 1. infinitely dense core left after supernova event; gravity warps space-time
  2. 2. icy remnants of solar system formation; have highly elliptical orbits
  3. 4. largest remnants of solar system formation or left after planetary collisions
  4. 6. older star made entirely of the older dense carbon core from red giant
  5. 7. rocky plantets such as Earth
  6. 9. modern accepted theory of a younger, expanding universe
  7. 10. less massive planet that lacks gravitational control of nearby objects
  8. 12. smallest rocky remnants of solar system formation
  9. 13. mature star actively fusing hydrogen to helium; gravity balanced by force of fusion
  10. 14. gas that all stars begin as; the mass will determine path of star's life
  11. 16. forms when small debris enters and burns in a planet's atmosphere
  12. 20. extremely dense core of once massive star left after supernova event
  13. 25. the inward force that hold stars together or makes them denser in old age