time dilation

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Across
  1. 4. future or the past
  2. 5. a period of time equal to a twenty-fourth part of a day and night and divided into 60 minutes
  3. 6. the slowing of time as perceived by one observer compared with another
  4. 7. moves at the fastest known speed in the universe
  5. 8. With respect to time
  6. 9. a period of time equal to sixty seconds or a sixtieth of an hour
Down
  1. 1. Not of or pertaining to time
  2. 2. The time when one wakes
  3. 3. time during which a machine, especially a computer, is out of action or unavailable for use
  4. 6. an area or stretch of land having a particular characteristic, purpose, or use, or subject to particular restrictions