After the 1985 miniseries Crisis on Infinite Earths, the Silver Age version of Krypton was replaced by a newer version. The Silver Age Krypton made a rare Post-Crisis appearance in The Sandman #48, during a flashback sequence. Krypton in the Modern Age of Comic Books The Man of Steel Following Crisis on Infinite Earths, which rebooted the history of the DC Universe and retroactively eliminated the existence of the Golden and Silver Age versions of Krypton, writer/artist John Byrne was given the task of recreating the entire Superman mythos. This rewrite was started in the 1986 Man of Steel miniseries, which addressed Krypton in both its opening and closing chapters. Krypton itself was the main subject of the late 1980s The World of Krypton miniseries (not to be confused with the 1979 miniseries of the same name). This miniseries was written by Byrne and illustrated by Mike Mignola, and filled in much of Krypton's new history. History The new Krypton was approximately one-and-a-half times larger than the Earth and orbited a red sun called Rao fifty light-years from the Solar System. Krypton's primordial era produced some of the most dangerous organisms in the universe. It was for this reason that 250,000 years ago, Krypton was chosen as the place to create Doomsday through forced evolution. Until its destruction, many dangerous animals, including ferrophage moles, still existed on Krypton. Kryptonians had to use their advanced technology to survive. Over 200,000 years ago, Krypton had developed scientific advancements far beyond those of present-day Earth, and had discovered a way to conquer disease and aging by perfecting cloning; vast banks of clones, kept in stasis, held multiple copies of each living Kryptonian so that replacement parts were always available in the event of injury. All Kryptonians were now effectively immortal, "with all the strength and vigor of youth maintained", and for millennia they enjoyed an idyllic, sensual existence in an Arcadian paradise. 100,000 years later Kryptonian society was tipping toward decadence and eventually political strife resulted from the debate about the use of clones (three by each Kryptonian; one child, one teen and one adult, perfectly preserved in stasis in large clone banks) to repair any hurt and avoiding death, if they were sentient beings and should have rights to be awakened to live as any other Kryptonian, sparked in addition by the presence of an alien missionary known as the Cleric, who