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Mysterious, city-size 'centaur' comet gets 300 times brighter after quadruple cold-volcanic eruption

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29P / Schwassmann-Wachmann ( 29P ) reawoken, unleashing four major eruptions in less than 48 hours .

The city-size comet appears almost 300 times brighter than normal, researchers say.

The four eruptions expelled a cloud of debris that reflected 289 times more light than the comet's nucleus.

This was 29P 's first major eruption since November 2022 , when it spewed 1 million tons of debris into space.