IYL 2015 Images

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    Monarch Butterflies Pismo Beach, California, USA

    Every year, monarch butterflies migrate from the same tree in the Eastern part of the United States to the same tree in California or Mexico. This is in spite of the fact that, by the time this journey is complete, this is not the same butterfly. Rather it is the fourth generation of the butterfly that originally left as the monarch only lives for an average of two months. Scientists think that the monarch butterflies know their route based on a combination of the position of the Sun in the sky, as well as a special photoreceptor in their antennae that acts as a chemical compass in the presence of the violet-blue part of visible light.
    Image Credit: J L Spaulding, creative commons license,
    view and download image here. http://lightexhibit.org/photoindex.html

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    Flight Path Of Fireflies Outside Okayama city, Japan

    When a living organism produces its own light, scientists call it "bioluminescence." Fireflies, also called lightning bugs, are some of the best-known examples of this process. Fireflies produce light when an organic compound in their abdomen, called luciferin, interacts with oxygen from the air. When this happens, light with a wavelength of between 510 and 670 nanometers—the color of pale yellow to reddish green—is generated. The special cells that hold the luciferin also contain uric acid crystals that help reflect the light away from the fireflies, making them even brighter for other fireflies and humans to admire.
    Image Credit: Tsuneaki Hiramatu
    view and download image here. http://lightexhibit.org/photoindex.html

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    Bioluminescence in the Gippsland Lakes Victoria, Australia

    Bioluminescence is light produced by a chemical reaction inside a living organism. There are many bioluminescent life forms on land, including different kinds of fungus and insects. Most bioluminescence, however, occurs in water, particularly in in the depths of Earth's oceans where sunlight cannot reach. Here we see the bioluminescent glow of marine plankton in the Gippsland Lakes in southeastern Australia. Above, the spectacular light of the Milky Way and star trails from a long exposure are also visible.
    Image Credit: Phil Hart
    view and download image here. http://lightexhibit.org/photoindex.html

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    Blueline Snapper Andaman Sea, Thailand

    This spectacularly colorful school of fish contains blueline snappers, a species native to certain parts of the Indian Ocean. The fish themselves do not possess the color we see in this image. Rather, the color is in the light that shines onto them from the Sun above. The atoms and molecules in the fish—as in every object— absorb some wavelengths of light and reflect others. We do not see that particular slice of color corresponding to wavelengths of light that are absorbed. Instead, it is the wavelengths and their respective colors that reflect back to us that allow us to see the dramatic appearance of these fish.
    Image Credit: Georgette Douwma/Science Photo Library
    view and download image here. http://lightexhibit.org/photoindex.html

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    Micrograph Of Algae and Moss

    This photomicrograph—an image taken through a microscope and captured with a camera—features an up close look at green algae and moss. The technique used to enhance the contrast in this photomicrograph is called "darkfield." To do this, a photographer excludes some of the light that enters the field of view so that very little light falls on anything except the specimen. This makes the field around the main targets darker, thus making the contrast more striking.
    Image Credit: Marek Mís
    view and download image here. http://lightexhibit.org/photoindex.html