HITOMI, the most sensitive X-ray satellite, was destroyed in March 2016, about a month after its launch. Despite its early destruction, HITOMI managed to perform significant science. The spacecraft observed the Perseus cluster, the brightest X-ray cluster in the sky, for three days. Analyzing the data, astronomers measured the motion of gas in the centre. Being able to measure gas motions is a major advance in understanding the dynamic behavior of galaxy clusters and its ties to cosmic evolution.