Image: SNR 5.4-1.2 and PSR B1757-24; the process described in Apokalpsis may result in a planetary scale life form that would seek out the densest source of hydrogen near it and which might come to look like the "Duck". I do not say that this IS what happened with the Duck; nonetheless, the Duck Mosaic is a provocative image. Please see here for scholarship relating to the Duck.
Image credit: the National Radio Astronomy Observatory/Associated Universities, Inc./National Science Foundation
Website design with thanks to Brian Steyer