Astronomers discover 200,000 metal-poor stars.

Astronomers have identified 188,002 candidate metal-poor stars by analyzing data from various astronomical surveys, including the Gaia satellite, LAMOST, and APOGEE. The discovery may help us better understand the chemical evolution of the universe. The team used the XGBoost algorithm to identify metal-poor stars in Gaia DR3 and obtained three corresponding candidate metal-poor star catalogs. The researchers managed to identify 127,096 bright and 60,906 faint candidate metal-poor stars in the Milky Way galaxy, which is around an order of magnitude larger than that from previous studies.