BBC News – Time travel: Light speed results cast fresh doubts

26 July 2011
Last updated at 05:46 ET

Physicists have confirmed the ultimate speed limit for the packets of light called photons – making time travel even less likely than thought.

The speed of light in vacuum is the Universe’s ultimate speed limit, but experiments in recent years suggested that single photons might beat it.

If they could, theory allows for the prospect of time travel.

Now, a paper in Physical Review Letters shows that ind… (View original article)