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Figure 1: Explosion d’un sursaut gamma :
après la formation d’un trou noir au centre de
l’étoile, les couches externes vont se précipiter.
Une partie de la matière pourra s’échapper
sous forme de deux jets lancés à une vitesse
très proche de celle de la lumière (crédit :
CNRS/ARTEMIS – Céline Lavalade)

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GRB 111209a est composée presque exclusivement d’hydrogène et
d’hélium. Sa masse est cinquante fois celle du Soleil et sa taille va au
delà de l’orbite de Jupiter. (Crédit NASA/GSFC)

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