IYL 2015 Images

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    22-Degree Halo Broken, Harz (Germany)

    When sunlight passes through ice crystals in cirrus clouds in the Earth's atmosphere, the refraction of sunlight by the ice crystals can create an optical phenomenon known as a 22-degree halo. Most of the halos appear as bright white rings, but sometimes the ice crystals act as tiny prisms and the halo will be tinged with various colors. The 22-degree halo happens most frequently around the Sun, but can also occur with the Moon (which is also called the "Moon ring" or "winter halo.)
    Image Credit: Lars0001/Wikimedia Commons
    view and download image here. http://lightexhibit.org/photoindex.html

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    Sun Dogs And Halo Around Setting Sun Farley, Iowa, USA

    The term "sun dog" refers to a pair of bright lights seen on either side of the Sun, typically when it is setting. Sun dogs belong to a large class of atmospheric phenomena caused by the bending of sunlight by small ice crystals in the air. The crystals act as prisms, bending the light rays. If the crystals are randomly oriented in the atmosphere, a complete ring around the Sun–a halo–is seen, as is the case with this photograph. The best time to see sun dogs is during the winter when the Sun is close to the horizon.
    Image Credit: Thomas DeHoff
    view and download image here. http://lightexhibit.org/photoindex.html

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    Rainbow Lands On Cow New Zealand

    Sunlight is made up of a mixture of many wavelengths of light. Each visible wavelength is perceived as a different color, with violet having the shortest wavelength, and red the longest. When sunlight enters a raindrop, its path is bent; the light is "refracted." Each wavelength is bent slightly differently, with shorter wavelengths bent more than longer ones. This rainbow is caused by light being refracted (bent) when entering a droplet of water, then reflected inside on the back of the droplet and refracted again when leaving it. This causes the combined colors of sunlight to spread out into the familiar red, orange, yellow, green, blue, indigo, and violet of a rainbow. Here we see a rainbow as it appears to touch down over a cow in New Zealand.
    Image Credit: Lisa & Jeffrey Smith
    view and download image here. http://lightexhibit.org/photoindex.html

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    Bluebells Buckinghamshire, England

    When light reaches a green plant, many different reactions take place to store the energy from light into sugar (aka, carbohydrate) molecules. The plant doesn't use all of the light that it receives. Plants absorb mainly the red and blue parts of visible light from the Sun. The green color we see most often in plants is there because it is a color that the plant reflects rather than absorbs. The green leaves and grasses in this photograph, found amid this field of bluebell flowers, reflect the green range of light, whereas the bluebells reflect blue light.
    Image Credit: Sue Vincent
    view and download image here. http://lightexhibit.org/photoindex.html

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    Sunflowers North Dakota, USA

    Perhaps one of the most remarkable phenomena on Earth is photosynthesis. This is the process that allows plants, bacteria, and algae to convert light from our Sun into chemical energy. Photosynthesis uses light to transform carbon dioxide and water into carbohydrates and oxygen. Since all animal life, including humans, eats plants–either directly or indirectly through animals–and uses oxygen to breathe, light is the fuel that allows us to exist.
    Image Credit: USDA
    view and download image here. http://lightexhibit.org/photoindex.html