It is a pleasure to acknowledge José M. Ibáñez and José M. Martí for valuable suggestions and a careful reading of the manuscript. I am particularly grateful to Miguel Angel Aloy, Harald Dimmelmeier, Charles Gammie, Konstantinos Kifonidis, Shin Koide, Christian Ott, Luciano Rezzolla, José V. Romero, Masaru Shibata, and Wai-Mo Suen for providing some of the figures and animations contained in the article. This research has been supported in part by the Spanish Ministerio de Ciencia y Tecnología (grant AYA2004-08067-C03-01). The author has made use of SAO/NASA’s Astrophysics Data System abstract service, which is gratefully acknowledged.
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