ASASSN-15lh
SUPERLUMINOUS EVENT · the record flash
For a while, this was the brightest explosion ever recorded: at peak it outshone the entire Milky Way many times over. What it actually was remains contested, an extreme supernova powered by a magnetar, or a star shredded by a rapidly spinning black hole. Either answer pushes physics to its edge, which is why a single flash kept hundreds of scientists busy for years.
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