The universe

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Across
  1. 2. Theory of the end of the universe were it gets torn apart
  2. 4. Theory of the end of the universe were it collapses onto itself
  3. 7. Made of rock or gas
  4. 10. Icy Rock that melts when coming close to a star
  5. 11. a star changes Hydrogen into this other element
  6. 12. Closest planet to the sun
  7. 13. cloud of gas and dust were stars can be born
  8. 17. rocky sphere that orbits around a planet
  9. 18. Energy pushing the universe to expand
  10. 19. Force that holds matter together
  11. 20. Emits light and Heat
Down
  1. 1. Created together with time, matter and gravity
  2. 3. happens in a star
  3. 5. Hot dense point full of energy that exploded 13.8Billion years ago
  4. 6. Rocky planet between Venus and Mars
  5. 8. The smallest building block
  6. 9. Made in the first stars
  7. 14. Theory of the creation of the universe the Big
  8. 15. Lives in a Belt and is made of rock
  9. 16. Type of super dense hole made after explosion of a massive star
  10. 18. Type of rocky planet that orbits around the sun but its orbit is not clear
  11. 19. Stars,solar systems comets, asteroids, gas and dust hold together by gravity