relevant crossword puzzle

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