As a Kryptonian, Superman's alien genetic material enables him to absorb sunlight and perform superhuman feats. Superman survived his death by entering into a hibernation-like state, and the Eradicator's use of him as a "conduit" by which he could absorb solar energy "restarted" Superman's body (Although sources such as Professor Hamilton and Batman have noted that available evidence suggests that the remaining solar energy reserves in Superman's body when he died would have actually "run down" before the Eradicator took his body, suggesting that other factors may have contributed to his resurrection).
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From the same Wikipedia EntryAs a Kryptonian, Superman's alien genetic material enables him to absorb sunlight and perform superhuman feats. Superman survived his death by entering into a hibernation-like state, and the Eradicator's use of him as a "conduit" by which he could absorb solar energy "restarted" Superman's body (Although sources such as Professor Hamilton and Batman have noted that available evidence suggests that the remaining solar energy reserves in Superman's body when he died would have actually "run down" before the Eradicator took his body, suggesting that other factors may have contributed to his resurrection).
