Planets

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Across
  1. 2. The sixth largest planet and the hottest planet in our solar system.
  2. 6. It’s the fourth largest, and the first planet discovered with math. Methane on its surface gives it a blue color.
  3. 7. The second largest planet in our solar system. It is also a massive ball made mostly of hydrogen and helium.
  4. 8. It’s the only planet we know of being inhabited entirely by robots.
Down
  1. 1. The largest planet in the solar system and more than twice as massive as the other planets combined.
  2. 3. It's the only place we know of inhabited by living things.
  3. 4. The third largest planet in our solar system and it appears to spin sideways.
  4. 5. The smallest planet in the solar system and is only slightly larger than Earth’s Moon.