THE UNIVERSE

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Across
  1. 4. a planet named after the roman God of commerce.
  2. 5. a part of a meteoroid, asteroid or comet that meks it to the ground
  3. 6. often called space dust
  4. 8. the coldest planet in our solar system
Down
  1. 1. its days last 10 hours.
  2. 2. a small, rocky or matellic object orbiting the sun
  3. 3. a small, icy and dusty object orbiting the sun
  4. 4. the streak of light that occurs when an object hits the Earth's atmosphere at high speed
  5. 7. the only planet that has liquid water on its surface