Scientists uncover what delayed Earths oxygen boom for a billion years

Researchers uncovered that trace compounds like nickel and urea may have delayed Earths oxygenation for millions of years. Experiments mimicking early Earth revealed how their concentrations controlled cyanobacterial growth, dictating when oxygen began to accumulate. As nickel declined and urea stabilized, photosynthetic life thrived, sparking the Great Oxidation Event. The findings could also guide the search for biosignatures on distant worlds.