Puzzle time

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Across
  1. 3. theorist of relativity
  2. 5. 3.14
  3. 6. rain protection
  4. 8. Minecraft is a...
Down
  1. 1. other word for fast
  2. 2. this causes balloons to fly up
  3. 4. were the planets are
  4. 6. unidentified flying object
  5. 7. plastic brick