These three images of comet Churyumov-Gerasimenko were acquired by the OSIRIS camera on board the Rosetta spacecraft on 29 July 2015. In the first image – acquired at 15:06 CEST – the outburst is not yet visible. Eighteen minutes later, the camera captures an enormous gas outflow. At 15:42 CEST, we see only weak remains of the jet. The images were acquired from a distance of 186 kilometres from the comet.