Definitions for "Population I"
younger stars found in greatest numbers in the outer portions of the Galactic disk.
The class of stars with relatively high abundances of heavy elements. These stars are generally found in the disk and spiral arms of spiral galaxies, and are relatively young. The term Population I is also commonly applied to other components of galaxies associated with the star formation, such as the interstellar material.
Young stars with relatively high abundances of metals, found in the disk of a galaxy, especially the spinal arms and in dense regions of interstellar gas. The Sun is a Population I star.