A star right here in the Milky Way galaxy is the purest ancient star astronomers have found to date. That means that it's remarkably (although not entirely) unpolluted by the metals that only formed after stars had already lived and died – a fossil relic of the early Universe, likely born from gas enriched by one of the early Universe's first supernova explosions . Once a low-mass Sun-like star, SDSS J0715-7334 has reached the end of its main-sequence lifespan and is now a red giant nearing the