GRB 050904
The most distant explosion ever detected occurred deep in the constellation Pisces. The explosion -- a gamma-ray burst, likely from a very early star explosion -- occurred nearly 13 billion years ago. The light passed by the Earth on September 4, 2005. A brilliant flash of gamma rays was detected by NASA's Swift satellite. An afterglow in infrared light detected by ground-based telescopes lingered for several days and allowed scientists to measure the distance to the burst (image and text courtesy: NASA)