Jentschke Lectures – Deutsches Elektronen-Synchrotron DESY https://www.desy.de/news/lecture_series/jentschke_lectures/archive/index_eng.html?printversion=1&printversion=1&printversion=1
DESY Lecture Series in Memory of Professor Dr. Willibald Jentschke
The first sounds that we heard were from unexpectedly heavy Black Holes.