The solar system

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Across
  1. 1. The furthest planet from the Sun until it was demoted from a planet to a dwarf planet in 2006.
  2. 4. A bright object in space that has a tail of gas and dust.
  3. 6. A very large cloud of dust and gas that exists in outer space.
  4. 8. The large group of stars and planets that the Earth and our sun are part of.
  5. 10. Any other planet.
  6. 12. An exploding star that produces an extremely bright light.
  7. 13. The area of gases and dust that form around a comet as it passes by the Sun.
  8. 15. The second closest planet to the Sun.
  9. 17. An instrument used to view objects in outer space.
  10. 18. A person who is specially trained to travel into outer space.
Down
  1. 2. The path a celestial object takes around a star or planet.
  2. 3. Any very bright star, especially one that a planet travels round.
  3. 5. A spiral galaxy where our Solar System and Earth are located.
  4. 7. The fifth largest planet in the Solar System and third from the Sun.
  5. 9. The American spelling of plough.
  6. 11. A very small star that does not shine brightly.
  7. 12. A natural or artificial object that is in orbit around a planet.
  8. 14. A dark area on the Sun caused by cooling from electromagnetic activity within the Sun.
  9. 16. Wind A stream of charged particles that is constantly flowing from the Sun.