relevant crossword puzzle

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Across
  1. 4. value representing the speed of light in base 300000 -
  2. 6. surname of the scientist who formulated the theoryof relativity (einstein)
  3. 7. increase in the mass
  4. 8. twins with a difference in aging after a space trip.(twins)
  5. 11. phenomenon in which time slows down to close to the speed
  6. 12. time dilation for moving objects (relativistic)
  7. 13. describes gravity as a curvature of space time
  8. 14. relativity)
Down
  1. 1. genius of the theory of relativity (Einstein)
  2. 2. maximum speed attainable in the universe. light
  3. 3. you can indicate that the answer is expressed in km/s
  4. 5. an object as it approaches the speed of light (mass)
  5. 9. represents the theory of special relativity.TRE)
  6. 10. light. (dilation)