Previous gas clouds found by astronomers show a higher enrichment level of heavy elements, so they were probably polluted by more recent generations of stars, obscuring any signature from the first stars, this is the first cloud to show the tiny heavy element fraction expected for a cloud enriched only by the first stars.

Neil Crighton

Categorized in : Science

Heavy elements weren't manufactured during the Big Bang, they were made later by stars, the first stars were made from completely pristine gas, and astronomers think they formed quite differently from stars today.