# Can you see yourself in a mirror when you are riding on top of a light stream?

What happens if you would ride on top of a light stream and you would look into a mirror that is in front of you, could you actually see your own face? I am asking this because I heard that nothing can be faster than light--shouldn't this be the case here as well?

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–  Qmechanic Apr 6 '11 at 20:04
You won't do anything at lightspeed. Literally. Time dilation is infinite, so absolutely nothing happens. Physicists consider any internal change to indicate that a particle is traveling slower than light (there was something going on about neutrinos changing type a while back, and that would indicate that they weren't massless particles at light speed). –  David Thornley Apr 7 '11 at 2:04
What about an external observer on earth, will he sees the image of the person riding the beam of light? –  user5411 Sep 25 '11 at 21:45
@user5411 You should have asked that as a new question, but seems like you're gone... –  Tobias Kienzler Jun 11 '13 at 13:18

## migrated from skeptics.stackexchange.comApr 6 '11 at 19:55

This question came from our site for scientific skepticism.

"So at any sub-light speed you can see yourself in a mirror just fine." - ignoring relativistic aberration and doppler shift, which would make a whole lot of difference near $c$ :) –  dbrane Apr 6 '11 at 20:13