Did supernova, known as PTF 11kly burn out 21 years ago.?

Captain Matticus, LandPiratesInc2011-09-08T13:30:14Z

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No. It died 21 million years ago. A type 1A supernova within 21 light years would be devastating to this planet.

Howard H2011-09-08T21:14:17Z

It is found in a galaxy 21 million light years away, so it flared 21 million years ago. This was during the early Miocene, for us earth-bound types.