After about 19 hours collecting samples on the moon's surface, the ascender module of the Chang'e-5 spacecraft blasted back into space. It entered lunar orbit and is on its way to rendezvous and dock. CGTN talked to Professor Yang Yuguang, from the International Astronautical Federation. Prof. Yang said that the moon lift-off is very challenging because it has minimal support compared with the ground-based launch. It is the first time that China has completed this process.