Space X-word

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Across
  1. 3. The first element to come into existence in the universe
  2. 5. The zone where liquid water could be found on a planet in a star system
  3. 7. A very dim star that never actually fuses atoms but glows from the friction of massive amounts of pressure; a _____ dwarf
  4. 9. stuff moving or waiting to move because of an invisible force
  5. 11. Atoms smashing together releasing tremendous amounts of energy; contained by an immense gravity field
  6. 13. The movement of continental plates over a molten core of magma
  7. 15. Because of our earth's angled axis ours change
  8. 16. spherical object orbiting a star that has cleared its path
  9. 19. Icy object orbiting a star
  10. 21. bang Name of the scientific theory that all matter and energy in the universe came from nothing
  11. 22. Makes advanced technology possible on our planet
  12. 24. A collapsed star that is so dense that nothing escapes it; a ____ hole
  13. 25. collection of star (solar) systems
  14. 26. Sweeps our solar system of most debris
  15. 27. Because our planet is just the right size this is not too thick and not too thin
  16. 29. Increases gravity
Down
  1. 1. An object orbiting a planet
  2. 2. Some of the first matter to come into the universe when the pure energy finally slowed down enough
  3. 4. Larger and larger objects being formed by the pull of gravity
  4. 6. Super dense ball of leftover material from a collapsed star. A " Giant Atom" about the size of the earth. A White ___
  5. 8. Rocky object orbiting a star
  6. 10. leftover stardust/ where stars are born
  7. 12. Hyper dense ball of neutrons leftover after massive star collapses; a _____ star
  8. 14. When a massive star can no longer sustain the balance between fusion energy pushing outwards and gravity pulling inwards it will go ______
  9. 17. collection of all galaxies
  10. 18. Decreases gravity
  11. 20. Before the first element came into existence these had to be present
  12. 23. System series of planets orbiting a star
  13. 28. A very dim star that consumes it's hydrogen very slowly; a ____ dwarf