#China just revealed the dramatic story behind the Shenzhou-20 spacecraft’s cracked porthole.⁣ ⁣ A triangular #crack was spotted on the window during preparations, triggering China’s first-ever emergency launch procedure.⁣ ⁣ Experts from the China Academy of Space Technology have now released more details of the incident and how the crew and ground teams responded.⁣ ⁣ #Shenzhou20 #ChinaSpace #SpaceEmergency