The Solar system

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Across
  1. 6. the only planet that has an atmosphere containing 21 percent oxygen
  2. 7. occurs when the Moon is between the Sun and the Earth.
  3. 8. The second largest planet in the solar system
  4. 9. The seventh planet from the sun
  5. 13. meteoroid that survives falling through the Earth’s atmosphere and colliding with the Earth’ surface
  6. 14. the largest moon in the Solar System
  7. 15. sun over 300000 times larger than earth
  8. 16. an artificial object that is deliberately sent into orbit in space
  9. 18. made up of everything that exists, including planets, stars, galaxies and all forms of matter and energy
  10. 20. First planet of the gas planets
  11. 21. system includes the Sun and all the objects that orbit around it due to its gravity
  12. 22. sphere of very hot gas called plasma which is held together by its own gravity
Down
  1. 1. a relatively small solar system body that orbits the Sun
  2. 2. The brightest planet in the solar system
  3. 3. a massive group of stars, star clusters, interstellar gas and dust, and dark matter which is all gravitationally bound together
  4. 4. cannot be seen without a large telescope and was first seen in 1846 from the observatory in Berlin
  5. 5. a person trained by a spaceflight program to lead, pilot or be a crew member of an expedition to space on a spacecraft
  6. 10. orbits the Earth every 27.3 days
  7. 11. spiral galaxy where our Solar System and Earth are located
  8. 12. The planet closest to the sun
  9. 13. a small rock or particle of debris in our solar system
  10. 17. also known as planetoids or minor planets
  11. 19. The red planet