Unit 4 HONORS Active Review

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