See on Scoop.it – Science Communication from mdashf
GHz makes the time window really small. For such a senstive time measurement one must make a correspondingly larger error on energy therefore mass. That is uncertainty principle of energy-time. SO …
mdashf‘s insight:
Experimental and theoretical reason why photons, the carriers that bring us light, are ones without any mass.
See on mdashf.org
M Dash Foundation: C Cube Learning 
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