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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 ...
Purple is a color similar in appearance to violet light. In the RYB color model historically used in the arts, purple is a secondary color created by combining red and blue pigments. In the CMYK color model used in modern printing, purple is made by combining magenta pigment with either cyan pigment, black pigment, or both.
Shades of purple. There are numerous variations of the color purple, a sampling of which is shown below. In common English usage, purple is a range of hues of color occurring between red and blue. [1] However, the meaning of the term purple is not well defined. There is confusion about the meaning of the terms purple and violet even among ...
Fuchsia (color) Fuchsia ( / ˈfjuːʃə /, FEW-shə) is a vivid pinkish-purplish- red color, [1] named after the color of the flower of the fuchsia plant, which was named by a French botanist, Charles Plumier, after the 16th-century German botanist Leonhart Fuchs . The color fuchsia was introduced as the color of a new aniline dye called ...
The Blue Marble is a photograph of Earth taken on December 7, 1972, from a distance of around 29,400 kilometers (18,300 miles) from the Earth's surface.. The original image (NASA designation AS17-148-22727) was taken by either Ron Evans or Harrison Schmitt of the crew of the Apollo 17 spacecraft on its way to the Moon, and showed the Earth with the south pole facing upwards; since then, a ...
First image, color images and movie of Earth from space taken by a person, by cosmonaut Gherman Titov – the first photographer from space. 1963 KH-7 Gambit: First high-resolution (sub-meter spatial resolution) satellite photography (classified). 1964 Quill: First radar images of Earth from space, using a synthetic aperture radar (SAR).
Violet is the color of light at the short wavelength end of the visible spectrum. It is one of the seven colors that Isaac Newton labeled when dividing the spectrum of visible light in 1672. Violet light has a wavelength between approximately 380 and 435 nanometers. [2] The color's name is derived from the Viola genus of flowers.
Seven Coloured Earths. Coordinates: 20°26′25″S 57°22′24″E. / 20.44028°S 57.37333°E / -20.44028; 57.37333. The seven Coloured Earths are a geological formation and prominent tourist attraction found in the Chamarel plain of the Rivière Noire District in south-western Mauritius. It is owned by a private company and the people ...