: As early as the 7th century BC, the Babylonians mapped the world as a disc surrounded by "bitter waters," beyond which lay seven mystical lands. These regions were described as the place "where the winged bird ends not his flight".
: At the very edge of our visibility lies the CMB, a "relic" radiation from the hot, dense early universe. Space Legends At the Edge of the Universe
In popular culture, the "edge of the universe" remains a fertile ground for speculative storytelling. Space Legends: At the Edge of the Universe - GamersGate : As early as the 7th century BC,
: The "edge" of our universe is not a physical wall but a limit of information. Because light takes time to travel, we can only see objects within a bubble roughly 93 billion light-years in diameter. In popular culture, the "edge of the universe"
: Many ancient Greeks believed that traveling far enough toward the world's edge would lead to savage lands inhabited by dog-headed people and tigers with human faces.