What is 10 miles across, but powers an explosion brighter than the Milky Way?

What is 10 miles across, but powers an explosion brighter than the Milky Way?
Right now, astronomers are viewing a ball of hot gas billions of light years away that is radiating the energy of hundreds of billions of suns. At its heart is an object a little larger than 10 miles across. And astronomers are not entirely sure what it is. If, as they suspect, the gas ball is the result of a supernova, then it's the most powerful supernova ever seen.

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