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Homework Help: Speed relativity, einsteins theorie

  1. Nov 10, 2012 #1
    1. The problem statement, all variables and given/known data
    astronaut has 8 years to get to a solar system that earthlings see is 80c years from earth. How fast does the astronaut have to go to get there in 8 years.

    2. Relevant equations

    3. The attempt at a solution
    L0 = 80 cyears
    T0 =8 years
  2. jcsd
  3. Nov 10, 2012 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Hint: Express the speed in terms of distance and time.
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