A light bulb that doesn't burn out but flares brighter and brighter until it blows the whole fixture apart. That's roughly how the most massive stars in the universe die. When a star's core heats up to billions of degrees, pairs of particles (electrons and their antimatter counterparts, positrons) begin to form. This process saps the energy that once held the star up, and it collapses, not quietly but in a monstrous thermonuclear explosion. Such an event is called a pair-instability supernova.

That's exactly the kind of blast that seems to have produced supernova 2023vbw. It erupted in a small galaxy where stars contain almost no heavy elements — an ideal place for such monsters. Telescopes tracked it for 190 days, and during that time it released ten times more energy than a typical core-collapse supernova. To pack that punch, the explosion must have hurled about 200–300 solar masses of material into space — a whole cloud of stellar matter.

But the most intriguing part isn't just the record-breaking brightness. The supernova's light revealed that the explosion wasn't perfectly spherical. The star's ejecta slammed into surrounding gas, and the shape of that collision exposed an asymmetry — perhaps the star shed its outer layers unevenly before dying. Such details will help us understand how giant stars live and die, the ones that once seeded the cosmos with the first heavy elements.

Right now we see only a handful of such flashes. But soon telescopes like the Vera Rubin Observatory will start finding them by the hundreds. Each one is a window into an era when the universe was young and full of stellar giants.