Thin disk 薄盘
The thin disk is a structural component of certain galaxies. The Milky Way's thin disk is thought to extend up to ~350 parsecs (1,100 ly) in the vertical axis and contributes about 85% of the stars in the Galactic plane. It can be set apart from the thick disc of a galaxy since the latter is composed of older population stars created at an earlier stage of the galaxy formation. Stars in the thin disk, on the other hand, are created as a result of gas accretion at the end stage of a galaxy formation.