Tianhe Core Module

 天和  'Harmony of the Heavens' ,officially the Tianhe core module 天和号核心舱, is the first module to launch of the Tiangong space station. It was launched into orbit on 29 April 2021, as the first launch of the final phase of Tiangong program (Project 921), part of the Chinese space program.

Approximately 4” Diameter