Supernova GRB 250314A (artist's concept)

This two-part illustration represents supernova GRB 250314A as it was exploding and three months after that when Webb observed it. Webb confirmed the supernova occurred when the universe was only 730 million years old.

On the left, the characteristic jets of a gamma-ray burst can be seen punching through material that was ejected by the supernova explosion.

On the right, the glowing supernova shines through gas continuing to rush outward from the blast.

In the background, the supernova’s host galaxy contains numerous bright star-forming regions.