The Solar system

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Across
  1. 3. The last planet of our solar system. It's made of ammonia, water and methane.
  2. 4. A cold desert planet. It's red due to rusty iron in the ground. Named after the Roman god of war.
  3. 7. It has a funny name and it's the only one to be sideways and rotates in the opposite direction.
  4. 8. A gas giant and the biggest planet in the Solar system.
Down
  1. 1. It's the smallest planet in our Solar system. It's also the closest to the Sun.
  2. 2. It's the hottest planet. It has a thick atmosphere full of the greenhouse gas carbon dioxide and clouds made of sulfuric acid. Named after the Roman goddess of fertility.
  3. 5. A gas giant with a very distinctive ring.
  4. 6. A very special planet because 70% of its surface is water. We can call it home.