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Images taken by the ATLAS telescopes before the explosion (middle) and after it (left) show the sudden brightening in the galaxy CGCG 137-068. The far-right image shows the difference between the two. (Stephen Smartt/ATLAS)

Astronomers puzzled by cow in the sky

In space, stars go supernova in brilliant bursts of light. Now, astronomers have detected a mysterious cataclysm in a neighboring galaxy. This puzzled astronomers...