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Travel at light speed

  1. Oct 17, 2015 #1
    How long/what distance would it take a spaceship (with a hypothetical propellant-less engine) to accelerate to near light speed, and secondly, how low long/what distance would it take to decelerate back to zero again?
  2. jcsd
  3. Oct 17, 2015 #2


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    Hello Mileymo, welcome to PF :smile: !

    Infinitely long to accelerate and the same to decelerate.

    If these answers are not to your liking, tell us some more at what level you are, at what level you'd like to be assisted. Better: pick up some introductory special relativity material and do the exercises -- and ask more questions here. Good hunting !
  4. Oct 17, 2015 #3


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    It very strongly depends on how near is "near light speed". In addition how large is the acceleration - usually it is limited by mechanical or human constraints - without a limit you can get to near light speed in a very short time.
  5. Oct 17, 2015 #4
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