Supermassive black holes, which lie at the centers of galaxies, are voracious. They periodically "sip" or "gulp" from the swirling disks of gas and dust that orbit them, which can result in massive outflows that affect star formation locally and farther afield. When the James Webb Space Telescope begins observing galaxies' cores, its infrared instruments will pierce through the dust to deliver images and incredibly high-resolution data that allow researchers to learn precisely how one process sets off another, and how they create an enormous feedback loop.