Population I

English Alternative forms en population I Etymology Proposed by astronomer Walter Baade in 1944. Proper noun Population mul I#Numeral en astrophysics usually _ attributively A population or group of stars formed relatively late in the history of the Universe, characterized by having a high metallicity. en Population II Population III en https://web.archive.org/web/20220915043424/https://www.forbes.com/sites/briankoberlein/2019/12/11/the-stars-in-our-galaxy-are-more-varied-than-we-thought/ w:Forbes We generally place stars into one of three populations based on their metallicity. Population I stars like the Sun are metal heavy. They are younger stars and tend to be found in the spiral arms of the Milky Way. The Stars In Our Galaxy Are More Varied Than We Thought 2019-12-11 Brian Koberlein en https://web.archive.org/web/20220706234948/https://www.nbcnews.com/science/science-news/ancient-star-casts-new-light-birth-universe-rcna943 w:NBC News Most stars, such as the sun, are third-generation "Population I" stars that contain relatively heavy elements such as iron, nickel, carbon and oxygen. An ancient star casts new light on the birth of the universe 2021-05-21 Tom Metcalfe en https://web.archive.org/web/20221209010212/https://www.scientificamerican.com/article/astronomers-grapple-with-jwsts-discovery-of-early-galaxies1/ w:Scientific American The brightness of these galaxies could be attributed to such stars, which would be much hotter and brighter than subsequent Population II stars and Population I stars, such as our sun, both of which fill our modern-day universe. Astronomers Grapple with JWST’s Discovery of Early Galaxies 2022-12-06 Jonathan O'Callaghan Derived terms en Pop I abbreviation Category:Stars en terms containing Roman numerals