Owen's crossword puzzle

123456789
Across
  1. 2. The biggest planet in our solar system
  2. 3. Major known as the big bear
  3. 5. the only star in the solar system
  4. 6. A "dirty snowball"
  5. 7. A meteor that hits Earth's surface
  6. 8. A natural satellite
  7. 9. Pluto is an example
Down
  1. 1. Believed in a heliocentric universe
  2. 4. Orion's belt is an example
  3. 7. "A shooting star"