Time machine

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Across
  1. 3. The second dimension
  2. 4. composes the tangible universe
  3. 6. Famous scientist who studied time
  4. 8. Scientific who hosted the reception for time travelers
Down
  1. 1. the fastest thing in the universe
  2. 2. The Theory Einstein developped as a concequence of his study of time
  3. 5. the main concept of the presentation
  4. 7. First name of Back to The Future main character