IYL 2015 Images

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    Earth Lights From ISS

    While moving at 17,000 miles per hour at an altitude of 240 miles above the Earth's surface on the International Space Station, NASA astronaut Don Petit was able to capture the lights from our planet in a unique way. His time-lapse photographs—taken from this unusual vantage point—feature star trails, terrestrial lights, and auroras. This image and others like them show how much artificial light from technology leaks into our shared night sky. Efforts are being made around the world to limit this so-called light pollution and keep the night skies dark for everyone to enjoy.
    Image Credit: NASA/JSC
    view and download image here. http://lightexhibit.org/photoindex.html

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    Earth Globe Africa, Europe & Asia

    Without the light from the Sun shining upon it, our Earth appears like a dark disk. This shroud of darkness falls every 24 hours as the Earth spins on its axis. The Sun's light rises in the east and eventually fades below the horizon in the west, ushering in night. There are still many places around the globe where our view of the night skies is unimpeded. However, in many urban, suburban, and even rural areas, artificial lighting and industrial development drown out the light from distant cosmic objects.
    Image Credit: NASA
    view and download image here. http://lightexhibit.org/photoindex.html

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    Earth At Night

    Even though much of globe is dark at night, great swaths of the planet are illuminated by human development. In most large cities of the world, it is no longer possible to appreciate the beauty of the night sky. Inefficient public lighting both wastes energy and causes "light pollution" that hides our Universe from us. Light pollution is a form of environmental degradation in which excessive artificial outdoor lights—such as street lamps, neon signs, and illuminated billboards—affect the natural environment and ecosystem.
    Image Credit: Marc Imhoff,Craig Mayhew,Robert Simmon/NASA Goddard Space Flight Center,Christopher Elvidge/NOAA,NGDC
    view and download image here. http://lightexhibit.org/photoindex.html

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    Earth Globe Asia

    As Earth spins on its axis every 24 hours, one side of the planet is illuminated by light from the Sun. This gives one-half of the planet its day, and at the same time the other half is immersed in night. While the Earth does not naturally emit any visible light, technology from humans has certainly made our planet brighter when facing away from the Sun. This image is a composite of two sets of data— one of the globe reflecting sunlight and another of the globe in full darkness, showing only the bright lights of inhabited areas.
    Image Credit: Data-AVHRR, NDVI, Seawifs, MODIS, NCEP, DMSP and Sky2000 star catalog; AVHRR and Seawifs texture-Reto Stockli; Visualization-Marit Jentoft-Nils
    view and download image here. http://lightexhibit.org/photoindex.html

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    The Thin Blue Line

    Earth's thin atmosphere is all that stands between life on Earth and the cold, dark void of space. This image, taken by astronauts aboard in the International Space Station in 2008, shows light from our Sun as it passes through these layers of gases that are held to the planet by Earth's gravity. Our planet's atmosphere has no clearly defined upper boundary, but instead gradually thins out into space. Most of the visible light from the Sun, as well as ultraviolet and infrared light, passes through the Earth's atmosphere. The atmosphere protects from more harmful types of light—such as X-rays and gamma rays—given off by cosmic sources.
    Image Credit: NASA
    view and download image here. http://lightexhibit.org/photoindex.html