The transparency of the Universe to Very High Energy Photons.

The detection of the blazar 3C279 at a record distance z=0.54 by MAGIC, and of other distant blazars by H.E.S.S. and VERITAS, indicate that the Universe is more transparent to very-high-energy gamma rays than previously thought on the basis of the estimates of the density of Extragalactic Background Light. The physical implications of these measurements will be discussed