Space Odyssey

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Across
  1. 2. The biggest planet.
  2. 5. Huge mixture of gas , dust, and stars.
  3. 6. Unidentified flying object.
  4. 7. Biggest space government agency in the world.
  5. 8. Number of planets in our galaxy.
  6. 9. Hot ball of hydrogen and helium.
Down
  1. 1. An object that moves around a bigger object.
  2. 3. Earth's natural satellite.
  3. 4. The star in our solar system.
  4. 5. Force that draws objects towards another.