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Dark Matter and Velocity

  1. Dec 17, 2007 #1
    If I was travelling 60% of light speed in one direction,
    and you were travelling 60% of light speed in another direction
    We would be invisible to eachother correct ?

    Is that all that dark matter is? matter in which the distance between us is increasing faster than light speed?
     
    Last edited: Dec 17, 2007
  2. jcsd
  3. Dec 17, 2007 #2

    Hootenanny

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    No, the speed of light as viewed from any frame of reference has a definite speed c.
     
  4. Dec 17, 2007 #3

    Janus

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    No, in fact, from each of our perpectives, the other would only be traveling at:

    [tex]\frac{0.6c+0.6c}{1+\frac{0.6c(0.6c)}{c^2}} = 0.882c[/tex]

    relative to ourselves. This is how velocities add under Relativity.
     
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