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Keck Observatory supernova

Last September, University of California at Berkeley astronomers observed the largest and brightest supernova on record. SN2006gy wasn't your typical exploding star, which brightens and dims in a matter of weeks. It took 70 days to reach full brightness and stayed brighter than any previously observed supernova for more than three months. Nearly 240 million light-years away, the supernova still outshines its host galaxy.

The ground-based observations were made at the University of California's Lick Observatory in California and the W. M. Keck Observatory in Hawaii.

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