China launched the Long March 2F Y22 rocket on Tuesday, sending the Shenzhou-22 spacecraft with no crew on board to dock with the Tiangong Space Station. This marks the first time in the history of China's manned space missions that a standby rocket and spacecraft have been launched to handle an emergency. The Shenzhou-21 crew will return to Earth via the Shenzhou-22 spacecraft. How important is this mission for China's space exploration? Check this video out.