For decades, the very first stars in the cosmos existed only in equations — theoretical objects predicted by models but never directly observed. The James Webb Space Telescope may have just changed that.

Astronomers analyzing JWST data have reportedly uncovered what they describe as the strongest evidence yet for “Population III” stars — the universe’s original stellar generation, thought to have formed within the first few hundred million years after the Big Bang. The chemical signature was reportedly detected in an object that formed roughly 400 million years after the birth of the universe, according to unverified reports. This article could not confirm these claims against a primary source.

That number is worth sitting with for a moment. The universe is roughly 13.8 billion years old. At 400 million years in, the cosmos was still chemically bare — almost entirely hydrogen and helium, with no carbon, no oxygen, no iron. Nothing you’d need to build a rocky planet, let alone a living cell. Those heavier elements had to be forged somewhere, and Population III stars were the first forges.

These early stars are believed to have been enormous — potentially hundreds of times the mass of the Sun — burning hot and fast, then detonating as supernovae within a few million years. In their deaths they scattered the first heavy elements into the surrounding gas, providing the raw material for every subsequent generation of stars and planets. Every carbon atom in your body was, through some long cosmic chain of custody, produced inside a star. Population III stars were the first link.

Previous claims of detecting these stars have surfaced before. What distinguishes this finding, according to the researchers, is the strength of the spectral signature — a chemical fingerprint reportedly consistent with enrichment by Population III supernovae.

The detection still requires confirmation through further observation. But if it holds, it begins to fill one of the most significant gaps in our understanding of cosmic history: the chapter where the universe, barely underway, started becoming the chemically complex place we now inhabit.