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B How thin can speed make things

  1. Oct 29, 2016 #1
    it is said that when something gets closer to the speed of light the flatter that thing will look when it pass the observer. i was wondering how flat that thing could look and could truly be 2D ???
  2. jcsd
  3. Oct 29, 2016 #2


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    Well, it can't get all the way to 0 thickness, so it is by definition 3D
  4. Oct 29, 2016 #3


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    You can make the measured length of an object arbitrarily close to zero by making it travel fast enough. It never reaches zero, though.

    How it actually looks is a rather complicated topic for an object moving near the speed of light because the object moves a significant distance in the time it takes light to cross the object, so you see different parts of the object at different places along its line of travel. I gather it actually looks rotated, at least to a first approximation.
  5. Oct 29, 2016 #4
    thank you for the insite:partytime:
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