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The Purple Earth Hypothesis (PEH) is an astrobiological hypothesis, first proposed by molecular biologist Shiladitya DasSarma in 2007, [1] that the earliest photosynthetic life forms of Early Earth were based on the simpler molecule retinal rather than the more complex porphyrin -based chlorophyll, making the surface biosphere appear purplish ...
Magic. The history of magic extends from the earliest literate cultures, who relied on charms, divination and spells to interpret and influence the forces of nature. Even societies without written language left crafted artifacts, cave art and monuments that have been interpreted as having magical purpose.
Qilin. The qilin ( English: / tʃiˈlɪn / chee-LIN; Chinese: 麒麟) is a legendary hooved chimerical creature that appears in Chinese mythology, and is said to appear with the imminent arrival or passing of a sage or illustrious ruler. [1] Qilin are a specific type of the lin mythological family of one-horned beasts.
The purple grid lines mark cosmological time at intervals of one billion years from the Big Bang. The cyan grid lines mark comoving distance at intervals of one billion light-years in the present era (less in the past and more in the future). The circular curling of the surface is an artifact of the embedding with no physical significance and ...
In folklore and fantasy, an enchanted forest is a forest under, or containing, enchantments. Such forests are described in the oldest folklore from regions where forests are common, and occur throughout the centuries to modern works of fantasy. They represent places unknown to the characters, and situations of liminality and transformation.
Magic circle. A magic circle is a circle of space marked out by practitioners of some branches of ritual magic, which they generally believe will contain energy and form a sacred space, or will provide them a form of magical protection, or both. It may be marked physically, drawn in a material like salt, flour, or chalk, or merely visualised.
The iconic photo of Earth known as The Blue Marble, taken by the crew of Apollo 17 (1972). This and similar images might have popularized Earth as a theme in fiction.: 138 The overwhelming majority of fiction is set on or features the Earth, as the only planet home to humans or known to have life.
The Discworld is the fictional setting for all of Terry Pratchett's Discworld fantasy novels. It consists of a large disc (complete with edge-of-the-world drop-off and consequent waterfall) resting on the backs of four huge elephants which are standing on the back of an enormous turtle, named Great A'Tuin (similar to Chukwa or Akupara from Hindu mythology) as it slowly swims through space.