DescriptionPhoton exiting and returning to the event horizon of a black hole.png
English: Geodesics of a photon emitted from a light source located on the event horizon of a black hole and with an impact parameter b > bcrit (Schwarzschild metrics).
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Trajectoire d'un photon émis depuis l'horizon des évènements d'un trou noir et y revenant (déviation de la lumière par gravitation - métrique de Schwarzschild).