Astronomy - Room 1

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Across
  1. 3. How old does the Big Bang Theory claim the universe is?
  2. 4. The chemical compound that causes Mars' red color
  3. 6. The terrestrial planet that spins in the opposite direction
  4. 7. An indentation on the moon's surface caused by asteroids
  5. 8. The first step of the star life cycle
  6. 11. Where most stars fall on an HR diagram
  7. 18. The process stars use to covert two hydrogens to one helium
  8. 19. The hottest planet in the solar system
  9. 20. The galaxy our solar system is part of
  10. 22. This layer of the Sun is where fusion occurs
  11. 23. The type of spacecraft that collects data by moving around on the surface
  12. 24. The name for the first 4 planets in our solar system
  13. 25. The largest planet in our solar system
Down
  1. 1. The theory that explains the formation of the solar system
  2. 2. The tilt of Earth's axis causes this
  3. 5. An ice giant that rotates on its side
  4. 9. The celestial body whose gravity csupergiantides
  5. 10. This law states that the farther away an object is, the faster it is moving.
  6. 12. The phase of the moon when it cannot be seen from Earth
  7. 13. Massive stars can become this after the red super giant phase
  8. 14. The distance light travels in 1 year
  9. 15. A planet known for its rings
  10. 16. When the moon is becoming more visible
  11. 17. This characteristic determines the color of a star
  12. 21. The region beyond Neptune that contains asteroids, debris, and Pluto