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