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" ... In terms of the amount of nuclear fusion per unit volume, that's merely the equivalent of converting about 3 femtograms of mass (3 × 10-18 kg) into energy each second for each cubic meter of space inside the Sun's core. For comparison, the Tsar Bomba — whose explosion all occurred in a fraction-of-a-second within a volume less than one cubic meter — converted more than 2 kg of mass (about 5 pounds' worth) into pure energy. ... "