Writing in the journal Nature, the scientists described the supernova death of a star estimated to be 50 to 100 times as massive as our sun in a galaxy called UGC4904 in the Lynx constellation. A supernova is a gigantic explosion that marks the demise of a star.

The researchers said Japanese astronomer Koichi Itagaki discovered a faint celestial explosion that remained visible for about 10 days in 2004, then detected a second, much more powerful explosion two years later.

 Source : MSNBC Space