Un photon met 170.000 années pour parcourir le trajet allant du noyau du soleil à sa surface, mais seulement 8 minutes pour faire le reste du voyage jusqu’à la terre.
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«L’énergie des photons de haute énergie (rayons X et gamma) libérés lors des réactions de fusion met un temps considérable pour traverser les zones de radiation et de convection avant d’atteindre la surface du Soleil. On estime que le temps de transit du cœur à la surface se situe entre 10 000 et 170 000 ans»
-https://fr.wikipedia.org/wiki/Soleil