The goodbyes were especially poignant for astronaut Daniel Tani who had a four-month stay on the station.During that time, his 90-year-old mother died in a car accident.

• 这次道别对宇航员丹尼尔.；塔尼来说更加意味深长，他在空间站上留驻了4个月，在此期间，他的90岁的母亲死于车祸。