quality:corruption
Hypothetical speculations without existing technologies

Russian cosmist Nikolai Fyodorovich Fyodorov advocated resurrection of the dead using scientific methods. Fedorov tried to plan specific actions for scientific research of the possibility of restoring life and making it infinite. His first project is connected with collecting and synthesizing decayed remains of dead based on "knowledge and control over all atoms and molecules of the world". The second method described by Fedorov is genetic-hereditary. The revival could be done successively in the ancestral line: sons and daughters restore their fathers and mothers, they in turn restore their parents and so on. This means restoring the ancestors using the hereditary information that they passed on to their children. Using this genetic method it is only possible to create a genetic twin of the dead person. It is necessary to give back the revived person his old mind, his personality. Fedorov speculates about the idea of "radial images" that may contain the personalities of the people and survive after death. Nevertheless, Fedorov noted that even if a soul is destroyed after death, Man will learn to restore it whole by mastering the forces of decay and fragmentation.

In his 1994 book The Physics of Immortality, American physicist Frank J. Tipler, an expert on the general theory of relativity, presented his Omega Point Theory which outlines how a resurrection of the dead could take place at the end of the cosmos. He posits that humans will evolve into robots which will turn the entire cosmos into a supercomputer which will, shortly before the Big Crunch, perform the resurrection within its cyberspace, reconstructing formerly dead humans (from information captured by the supercomputer from the past light cone of the cosmos) as avatars within its metaverse.

David Deutsch, British physicist and pioneer in the field of quantum computing, formerly agreed with Tipler's Omega Point cosmology and the idea of resurrecting deceased people with the help of quantum computers but he is critical of Tipler's theological views.

Italian physicist and computer scientist Giulio Prisco presented the idea of "quantum archaeology", "reconstructing the life, thoughts, memories, and feelings of any person in the past, up to any desired level of detail, and thus resurrecting the original person via 'copying to the future'".

In their science fiction novel The Light of Other Days, Sir Arthur Clarke and Stephen Baxter imagine a future civilization resurrecting the dead of past ages by reaching into the past, through micro wormholes and with nanorobots, to download full snapshots of brain states and memories.