Moon Formation

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Across
  1. 3. Giant indents on moon's surface
  2. 6. Light, ashy part of the moon
  3. 8. Giant "planet" in Earth's orbit
  4. 9. The curved path an object takes as it moves around a central body
  5. 10. Mars-sized object that supposedly crashed into Earth
  6. 11. Who discovered the moons mountains?
Down
  1. 1. A theory evolving a Mars-sized object, crashing into Earth
  2. 2. Who proposed the theory, The Giant Impact Theory
  3. 4. First person to observe the moon through a telescope
  4. 5. Dark part of the moons surface
  5. 7. How many major impact theories are there?