K. Nandra, X. Barcons, D. Barret, A. Fabian, J.W. den Herder, L. Piro, M. Watson et al.
This White Paper entitled "The Hot and Energetic Universe" (as submitted to ESA) advocates the need for a transformational leap in our understanding of two key questions in astrophysics:
1) How does ordinary matter assemble into the large scale structures that we see today? and 2) How do black holes grow and shape the Universe?