Solar system

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Across
  1. 5. Stars are burning balls of _____.
  2. 6. looks blue because about 71% of it is covered with water.
  3. 8. When asteroids hit each other they may break into small pieces to form ____.
  4. 10. has a red surface because of the rusting of the iron.
  5. 12. biggest planet in the solar system.
  6. 13. has the brightest ring.
  7. 14. The surface of the Sun is ____ than its core.
Down
  1. 1. hottest planet in the solar system.
  2. 2. appears blue because its atmosphere contains methane
  3. 3. comet are ball of ____ and dust.
  4. 4. The Sun is a _____.
  5. 7. rock pieces that orbit the Sun.
  6. 8. smallest planet and closest planet to the Sun in the solar system.
  7. 9. planet has other objects in its orbit path
  8. 11. has stron winds (2,500 km/hour)