crystal constructed the massive crystalline Fortress of Solitude. Inside, an artificially intelligent hologram of Jor-El appeared to him and initiated twelve years of Kryptonian education. These virtual versions of Jor-El and Lara remained as constructs within the Fortress throughout the series. Superman's symbol was given a Kryptonian origin in the film. Male Kryptonians were shown wearing unique symbols on the chests of their robes, similar to a family crest; Jor-El and Kal-El wore the familiar S-shield, which Lois Lane later assumed to be the letter S from the familiar Latin alphabet, and thus dubs him "Superman". Superman Returns The 2006 film Superman Returns presents a version of Krypton almost identical to Superman. In the beginning of the film, scientists discover remains of Krypton, and Superman leaves Earth for five years to look for it. His ship is seen leaving the dead planet. The planet is destroyed when the red supergiant Rao becomes a supernova. Superman Returns extends the crystalline Kryptonian technology from Superman which allowed young Clark Kent to "grow" the Fortress of Solitude. Kryptonian crystals are able to grow huge land masses and incorporate the properties of the surrounding environment; a sliver taken from one of the crystals used to test the theory causes Lex Luthor's basement to be filled with a huge crystal structure. Growing land in this manner causes widespread power failure. Lex Luthor later combines one of the crystals with kryptonite and shoots it into the ocean, creating a new land mass he calls "New Krypton". Superman uses his heat vision to get under the crust of the island and throws it into space, including the other crystals that Luthor wanted to use to set up a real estate scam, despite the warning that many people would die from the massive tsunamis and earthquakes that the crystals would create. The novelization by Marv Wolfman states that one of Superman's ancestors helped civilize Krypton long ago. DC Extended Universe The DC Extended Universe'''s Krypton is introduced in the 2013 film Man of Steel and adds strong dystopian elements to Krypton and its fate. The planet is portrayed as having an Earth-like terrain composed of mountains, canyons and oceans. The planet is 8.7 billion years old and approximately 27.1 light years from Earth. Its parent star Rao is depicted as a 13 billion year old red dwarf sun. Its gravity is much higher than that of Earth, and