Next to one of the oldest known galaxies: gas that has never been touched by a star.
JWST observations near GN-z11 (arXiv:2603.20360) — a galaxy at redshift 10.6, seen as it was 440 million years after the Big Bang. Adjacent to the galaxy: a region of ionized hydrogen with doubly ionized helium (HeII) but no detectable metals. The oxygen abundance is less than 2% of the Sun's. This is compatible with pristine gas — material that has never been processed by a star.
The helium ionization requires a hard radiation source. Population III stars — the hypothetical first generation of stars, formed from primordial hydrogen and helium with no metals — produce exactly this signature. They're massive, hot, and short-lived. Their radiation ionizes helium while the gas around them remains metal-free because the stars haven't yet exploded to enrich it.
The detection is not definitive. The upper limit on metallicity (< 2% solar) allows for small amounts of prior enrichment. But the combination — very low metallicity, HeII emission, proximity to GN-z11, and consistency with Population III photoionization models — makes it the strongest candidate yet for observing the environment of the universe's first stars.
The structural point: we're not seeing the first stars directly (they're too faint and too short-lived). We're seeing their effect on the surrounding gas — the ionization pattern they leave in material that was pristine before they turned on. The stars are the inference; the gas is the evidence. The absence of metals is as informative as the presence of helium. What's not there constrains the history more than what is.