solar system

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Across
  1. 1. distance travelled by light in a vaccum in one tropical year
  2. 2. morning star
  3. 5. smaller bodies in orbit around the sun
  4. 7. the red planet
Down
  1. 1. an earths layer including crust and mantle
  2. 3. blue planet
  3. 4. titan is the largest moon of
  4. 6. a liquid layer of iron and nickel