摘要
After blazing through the atmosphere,the debris of the retired Tiangong-2 space laboratory splashed into the south Pacific on the evening of July 19,staging a glorious homecoming The space lab,launched on September 15,2016,had hurtled in orbit for morethan 1,000 days before commencing its controlled deorbiting,which is a crucial step since a spacecraft out of control maypose a danger to other spacecraft in orbit and to humans on the ground,said Zhu Congpeng,chief designer of the space lab.
