Astronomy Crossword

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Across
  1. 2. Known as the "Dwarf planet."
  2. 4. Hottest planet in our Solar system
  3. 6. Coldest planet in our Solar system
  4. 8. Contains a trail of gas and dust pointing away from the Sun
Down
  1. 1. The biggest planet in our solar system
  2. 3. A small rocky object that orbits the sun
  3. 5. The source of heat in our solar system
  4. 7. The planet in which we live.