{"version":"1.0","type":"link","title":"G-dwarf problem - Newikis","description":"In astronomy, the G-dwarf problem refers to the apparent discrepancy in the distribution of metallicity levels in stars of different populations as compared to closed box models of galactic chemical evolution. According to closed box models, which represent galaxies without outside non-metallic…","provider_name":"Newikis","provider_url":"https://newikis.com","cache_age":86400,"thumbnail_url":"https://thumb.wikimedia.org/wikipedia/commons/thumb/7/70/Morgan-Keenan_spectral_classification.svg/1280px-Morgan-Keenan_spectral_classification.svg.png","thumbnail_width":1280,"thumbnail_height":498}