Credit: NASA / ESA, CXC, JPL-Caltech, STScI, NAOJ, J.E. Geach (Univ. Durham) et al.
Illustration: NASA/CXC/M.Weiss
Explanation: Dubbed a Lyman-alpha blob, an enormous cloud of hydrogen gas spans several hundred thousand light-years in this remarkable image (left), a composite of x-ray, optical, and infrared data from space and ground based observatories. The gigantic, amoeba-like structure is seen as it was when the universe was a mere 2 billion years old (about 12 billion years ago). Click to enlarge.
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