Astronomers have witnessed a cosmic weather event that has never been seen before — a cluster of giant gas clouds raining in on the supermassive black hole at the center of a very distant giant elliptical galaxy. Abell 2597 BCG: the background image (blue) is from the NASA/ESA Hubble Space Telescope; the foreground (red) is ALMA data showing the distribution of carbon monoxide gas in and around the galaxy; the pull-out box shows the ALMA data...