The world around you...

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Across
  1. 3. Why you can go lightspeed without looking
  2. 4. Moon's rotation and revolution
  3. 5. What doing the Monty Hall problem increases
  4. 6. Foundation importance in Quantum Mechanics
  5. 7. Made after stars
  6. 10. Caused by runaway Greenhouse
  7. 11. formed by Earth cooling
  8. 14. Only if you control your gravitational orbit
  9. 16. we believe ours is one of an infinite number
  10. 17. Why the moons maria are only on our side
  11. 18. 3 main Greenhouse Gases
Down
  1. 1. In the middle of any spiral galaxy
  2. 2. Determines which allele is most fit
  3. 6. Makes each element different
  4. 8. Gravity's way of making elements
  5. 9. Wavelength and angle of light
  6. 12. Caused by the Earth's internal heat
  7. 13. One of the first three
  8. 15. Created the important gases in our atmosphere