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High Quality Content by WIKIPEDIA articles! A pair instability supernova occurs when pair production, the production of free electrons and positrons in the collision between atomic nuclei and energetic gamma rays, reduces thermal pressure inside a supermassive star's core. This pressure drop leads to a partial collapse, then greatly accelerated burning in a runaway thermonuclear explosion which blows the star completely apart without leaving a black hole remnant behind.Pair instability supernovae can only happen in stars with a mass range from around 130 to 250 solar masses and moderate metallicity (low abundance of elements other than hydrogen and helium, a situation common in Population III stars). The recently observed objects SN 2006gy and SN 2007bi are hypothesized to have been a pair instability supernova.