2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/6858I discuss Chandra X-ray Observatory measurements of cavities in galaxy clusters and their implications for heating the intracluster gas. The emerging paradigm for cooling flows has important implications for understanding self-regulated galaxy formation.Four pages. Contributed paper, Carnegie Observatories Centennial Symposium "Clusters of Galaxies: Probes of Cosmological Structure and Galaxy Evolution ed. J.S. Mulchaey, A. Dressler, and OemlerAstrophysicstext