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  2. Timeline of first images of Earth from space - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_first_images...

    First full-disk black-and-white filtered [40] color picture of the Earth. [6] November 10, 1967 ATS-3: First full-disk "true color" [41] picture of the Earth; [42] subsequently used on the cover of the first Whole Earth Catalog. [43] [42] December 21, 1968 Apollo 8: First full-disk image of Earth from space taken by a person, probably by ...

  3. On Colors - Wikipedia

    en.wikipedia.org/wiki/On_Colors

    On Colors (Greek Περὶ χρωμάτων; Latin De Coloribus) is a treatise attributed to Aristotle [1] but sometimes ascribed to Theophrastus or Strato.The work outlines the theory that all colors (yellow, red, purple, blue, and green) are derived from mixtures of black and white.

  4. Overview effect - Wikipedia

    en.wikipedia.org/wiki/Overview_effect

    Eventually, White wrote about the effect in his book The Overview Effect — Space Exploration and Human Evolution (1987), [13] which has a fourth edition (2021). [11] White's work did not attain broad influence until the 2010s—a period of increased societal divisions and a new prospect of private space travel. [14]

  5. Pale Blue Dot (book) - Wikipedia

    en.wikipedia.org/wiki/Pale_Blue_Dot_(book)

    The first part of the book examines the claims made throughout history that Earth and the human species are unique. Sagan proposes two reasons for the persistence of the idea of a geocentric, or Earth-centered universe: human pride in our existence, and the threat of torturing those who dissented from it, particularly during the time of the Roman Inquisition.

  6. Aether (classical element) - Wikipedia

    en.wikipedia.org/wiki/Aether_(classical_element)

    According to ancient and medieval science, aether (/ ˈ iː θ ər /, alternative spellings include æther, aither, and ether), also known as the fifth element or quintessence, is the material that fills the region of the universe beyond the terrestrial sphere. [1]

  7. Purple Earth hypothesis - Wikipedia

    en.wikipedia.org/wiki/Purple_Earth_hypothesis

    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 ...

  8. Color theory - Wikipedia

    en.wikipedia.org/wiki/Color_theory

    Color theory, or more specifically traditional color theory, is the historical body of knowledge describing the behavior of colors, namely in color mixing, color contrast effects, color harmony, color schemes and color symbolism. [1] Modern color theory is generally referred to as Color science.

  9. On Vision and Colours - Wikipedia

    en.wikipedia.org/wiki/On_Vision_and_Colours

    On Vision and Colors (originally translated as On Vision and Colours; German: Ueber das Sehn und die Farben) is a treatise [1] by Arthur Schopenhauer that was published in May 1816 when the author was 28 years old.