Light shed on a superluminous supernova which appears to have exploded twice

The Gran Telescopio CANARIAS (GTC), located about 2,400 meters altitude in the Observatorio del Roque de los Muchachos, en Garafía (La Palma). Credit: Pablo Bonet.
The Gran Telescopio CANARIAS (GTC), located about 2,400 meters altitude in the Observatorio del Roque de los Muchachos, en Garafía (La Palma). Credit: Pablo Bonet.
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