comment: >
  
  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.
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.