Alessandra Venditti

In the James Webb Space Telescope's images, bright dots thought to be distant galaxies might actually be explosions of the first stars — pair-instability supernovae. These cosmic fireworks happen when a massive star made of pure hydrogen and helium is torn apart as light transforms into matter and a

Near the galaxy GN-z11, seen just 400 million years after the Big Bang, the James Webb Space Telescope spotted a bright spot. It glows with hot helium — such radiation can only come from very massive stars devoid of heavy elements, that is, the first generation. If confirmed, we are seeing for the f