G-dwarf problem

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 material inflow, the distribution of metallicity levels in stars should follow a logarithmic curve.

However, these models are inconsistent with Milky Way observations.

[2] The name comes from G-type stars, which are bright enough to be studied easily, yet are most often found unevolved.

This article about stellar astronomy is a stub.

Morgan-Keenan spectral classification of stars . Most common star type in the universe are M-dwarfs , 76%. The Sun is a 4.6 billion year-old G-class ( G2V ) star and is more massive than 95% of all stars. Only 7.6% are G-class stars