comment: >
  
  But by the time they make the repair couldn't they have arrived?
context: 100 light years away. 
  So if we were on that planet and looking at earth with a super powerful telescope, we’d be looking at the roaring 20s. I think. Science is hard. >
  
  And if we then got on a spaceship that travels at the speed of light and set out to go check out Earth, we wouldn’t show up until 200 years after the events witnessed through the telescope. >
  
  But when we arrive we wouldn't have significantly aged at all. >
  
  If you rode a spaceship a light speed for 100 years. Wouldn't you age 100 years?
  E: If you were then to look back at earth. It would appear as if nothing had changed at all. >
  
  The faster you travel, the more time dilates. At the speed of light, time does not move at all. 
  From an outside observers perspective it would take 100 years. For anyone on the ship it would be instantaneous, if you assume no acceleration or deceleration period. >
  
  So… how would you pilot the ship or address any issues that come up, like repairs? >
  
  In this scenario the ship is moving at the speed of light so it is not experiencing time, just like the people inside it.
  It cannot breakdown while moving at  lightspeed, because no time can pass to allow failures to occur.
  But matter can't actually go the speed of light, only energy can, so this is all just a fun thought exercise. >
  
  So at 90% of the speed of light how does one do repairs? >
  
  In theory, exactly the same as any other spaceship. 
  Anyone attempting repairs is operating in the same inertial reference as the ship, so from their perspective it's no different from repairing a ship at any other speed.