A hypernova was originally postulated to explain the great amount of energy seemingly liberated in a gamma-ray burst . A search for visible remnants of hypernovae has now yielded the above two candidates . Remnant NGC 5471B on the upper left and MF83 below were identified by the unusually high amount of X-ray radiation they emit. MF83 is also one of the largest expanding shells ever found. Research continues into the possible nature and visibility of hypernovae and the gas shells they likely leave behind.
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