Back in time in the black hole's activity (IMAGE) Università di Bologna Caption The researchers observed for the first time the evolution of warm gas coming from an active black hole: they were able to look at these structures, strongly reminiscent of the smoke streams produced by volcanic eruptions with unprecedented detail and on a time scale of a hundred million years. Credit University of Bologna Usage Restrictions Credit must be given to the creator. License CC BY Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.