The universe

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Across
  1. 2. a proof that you have done something
  2. 3. many of them are flying around earth atmosphere
  3. 5. something new is explored and built by scientists
  4. 6. other word for universe
  5. 7. the moon ..... around the earth
  6. 9. a person who analyses and invents things
  7. 11. with this object we can fly to mars
Down
  1. 1. humanity is gaining more and more .....
  2. 4. our eight planets and the sun
  3. 8. a big yellow fire ball (star)
  4. 10. our home planet