Time Travel

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Across
  1. 2. nothing can escape from it
  2. 5. is a theory
  3. 7. what happened before
  4. 8. famous scientist
  5. 9. smaller than hours
  6. 13. what time is
Down
  1. 1. pulls us towards the earth's core
  2. 3. what lies ahead
  3. 4. smaller than minutes
  4. 6. first name stephen
  5. 10. next to time in the title
  6. 11. smaller than days
  7. 12. is on clocks