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Supernova 2006gy in the galaxy NGC 1260 is the most luminous one recorded\cite{2006CBET..644....1Q, 2006CBET..647....1H, 2006CBET..648....1P,2006CBET..695....1F}. Its progenitor might have been a very massive ($>100$\msun) star \cite{2006astro.ph.12617S}, but that is incompatible with hydrogenin the spectrum of the supernova, because stars $>40$ \msun are believed tohave shed their hydrogen envelopes several hundred thousand years before theexplosion \cite{2005A&A...429..581M}. Alternatively, the progenitor might havearisen from the merger of two massive stars \cite{2007ApJ...659L..13O}. Here weshow that the collision frequency of massive stars in a dense and young cluster(of the kind to be expected near the center of a galaxy) is sufficient toprovide a reasonable chance that SN 2006gy resulted from such a bombardment. Ifthis is the correct explanation, then we predict that when the supernova fades(in a year or so) a dense cluster of massive stars becomes visible at the siteof the explosion.

A runaway collision in a young star cluster as the origin of the brightest supernova