Inner/Outer planets

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Across
  1. 3. an outer planet (the fifth planet from the sun and is the largest solar system)
  2. 4. is an inner planet (the fourth planet from the sun and is the second smallest planet in the solar system)
  3. 5. is an outer planet (is the eight and FARTHEST-known planet in the solar system from the sun)
  4. 7. is an outer planet (is the seventh planet from the sun)
Down
  1. 1. is an outer planet (the sixth planet from the sun and is the second-largest planet in the solar system)
  2. 2. is an inner planet (is the second planet from the sun)
  3. 4. is an inner planet (known as the smallest solar system and is also the closest to the sun, spot #1)
  4. 6. is an inner planet (is the third planet from the sun and is THE ONLY astronomical object known for HARBOR LIFE)