Hercules A is powered by a supermassive black hole located at its centre,which feeds on the surrounding gas and channels some of this gas into extremely fast jets. Our new high-resolutions observations taken with the LOFAR have revealed that this jet grows stronger and weaker every few hundred thousand years. This variability produces the beautiful structures seen in the giant lobes, each of which is about as large as the Milky Way galaxy.Credit:R. Timmerman; LOFAR & Hubble Space Telescope