About the Cover

Visualization of two black holes colliding and the resulting gravitational waves generated, based on simulations of the event detection from the LIGO experiment announced in February 2015. Credit: Visualization by Carson Brownlee, Intel, using ParaView with OSPRay. GR-Chombo simulation data from Pau Figueras, Markus Kunesch, Saran Tunyasuvunakool, Juha Jäykkä, Stephen Hawking Centre for Theoretical Cosmology.