Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Breaking the speed of light?

  1. Apr 21, 2009 #1
    2 objects are traveling in opposite directions from each other with more than 0,5c. Would an observer watching them perpendicular to their trajectory see that they are moving faster than c away from each other, or is there something that will "stop" this?
     
  2. jcsd
  3. Apr 21, 2009 #2

    jtbell

    User Avatar

    Staff: Mentor

    IN that observer's reference frame, the two objects' separation does increase at a rate greater that c. Relativity does not prevent the rate of separation of two objects in a third reference frame from being greater than c.

    What relativity does prevent is each object going faster than c in the other object's reference frame.
     
  4. Apr 21, 2009 #3
    Thanks, that was exactly what I was uncertain about. You answered my question in the best possible way.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook