Space Crossword

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Across
  1. 3. something that brings samples from other planets
  2. 6. consisting of a luminous spheroid of plasma held together by its own gravity
  3. 8. science of the origin and development of the universe
  4. 10. air, is the layer of gases retained by earth's gravity that surrounds the planet
  5. 11. unit of length used to express astronomical distances
  6. 12. the hottest planet
  7. 14. something that goes around something
Down
  1. 1. the biggest and most needed planet
  2. 2. gravataional boud system
  3. 4. a planet outside the solar sytsem
  4. 5. a natural science that studies celestial objects and phenomena
  5. 7. the measerment between something
  6. 9. something that is used to look at space
  7. 10. someone who studdies astronomy
  8. 13. the farthest planet from earth