Each image in this collection represents the effective perspective of a chosen reference node in the worldwide air transportation network. The radial distance is proportional to the effective distance from the reference node. Some of the major airline hubs are labeled. You may contact us at email@example.com for a high-res JPG of any image in this collection. This image relates to a paper that appeared in the 13 Dec., 2013, issue of Science, published by AAAS. The paper, by Dirk Brockmann at Robert-Koch-Institute in Berlin, Germany, and colleagues was titled, "The Hidden Geometry of Complex, Network-Driven Contagion Phenomena."