A wrinkle in time

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Across
  1. 3. odd
  2. 7. a mistake
  3. 9. spiky
Down
  1. 1. wonderful
  2. 2. kids
  3. 3. famous
  4. 4. a made up planet
  5. 5. speaking
  6. 6. big
  7. 8. a maths concept