Planet-scale networks of radio telescopes are not the only way to visualise a black hole - mathematicians have been doing if for decades, with equations and diagrams based on the mathematics of general relativity. Foundations of General Relativity by Klaas Landsman explains the history, concepts, and mathematics behind these theories, so that readers can follow the latest research in general relativity and black holes for themselves. Watch our animation to find out more: | Sci Ani