"The explosion generated several Suns' worth of radioactive nickel-56 and vast quantities of other lighter elements, such as carbon and silicon. Gal-Yam says that it is the radioactive decay of the nickel that kept the explosion glowing for months."
Taken from:
Nature News
This is the biggest star explosion ever recorded. It was 200 solar masses. The light lasted several months.
56 Ni is formed, and radioactively disintegrates powering the explosion for months!
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