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A comment on Photons cooled down to room temperature, made into a blob of matter. Parent comment

Re:Photons cooled down to room temperature, made into a blob... by Estragon on Wednesday November 24, 2010 @05:17PM (#1938707)
I don't really know what it means, but my understanding is that photons actually have a mass. E=mc^2 => m=E/c^2, and photons have energy...
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Re:Photons cooled down to room temperature, made into a blob... by rorrr on Wednesday November 24, 2010 @07:09PM (#1938919)
Photons don't have a mass. If they did, they wouldn't be able to travel at the speed of light (it takes infinite energy to make any mass travel at the the speed of light).

http://en.wikipedia.org/wiki/Photon#Experimental_checks_on_p...

E = mc^2 applies to matter, not photons.

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