Solar system

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Across
  1. 3. One trip around the sun is called a ____?
  2. 4. You can use this to look at far away objects
  3. 7. The closest planet to the sun
Down
  1. 1. Is no longer considered a planet
  2. 2. The planet that we live on
  3. 5. The explosion of a star is called a ______?
  4. 6. The star at the centre of our solar system is the ____?