Our Solar System

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Across
  1. 4. 12 people walked on it
  2. 5. primarily made of gases
  3. 7. does not have any moon or rings
  4. 9. densest planet in the solar system
Down
  1. 1. largest dwarf planet
  2. 2. reaches temperature of 15 million Celsius
  3. 3. icy objects on edge of solar system
  4. 4. way contains black hole in the center
  5. 6. has a retrograde orbit
  6. 8. also known as red planet