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