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Thin discIt is one of the components of some galaxies.GalaxyThe thin disk of is considered to extend to~1 in the direction perpendicular to the axisKilosecond gap（3.3Thousand light years）And 85% of the stars are on this disk.
It can be connected with theThick discBecause the later stars are old stars created in the early stage of galaxy formation.On the other hand, stars in thin disks are created by the accretion of gas at the end of the formation phase of galaxies.
The stars in the thin disk contain a wide range of ages, and can be divided into different sub series according to the Cenozoic area of age.However, it will still be younger than the thick plate.
The main characteristic structures of the Milky Way include the central nucleus ball, the silver disk and the silver halo.Among them, the silver disk includes thick disk and thin disk. The thick disk stars form before the thin disk stars, that is, the thin disk is younger than the thick disk.The formation of thin disks is a very important event in the Milky Way in the past 8 billion years.[1]
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Chinese astronomers have found that the earliest known thin disk stars in the Milky Way are about 9.5 billion years old.This provides an important observational basis for a deep understanding of the early formation and evolution history of the galactic thin disk.[1]
