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        {
            "id": 3149,
            "url": "http://svs.gsfc.nasa.gov/3149/",
            "result_type": "Visualization",
            "release_date": "2005-05-04T12:00:00-04:00",
            "title": "Gamma Ray Bursts May Have Caused Ancient Extinctions",
            "description": "Scientists at NASA the University of Kansas say that a mass extinction on Earth hundreds of millions of years ago could have been triggered by a star explosion called a gamma-ray burst. The scientists do not have direct evidence that such a burst activated the ancient extinction. The strength of their work is their atmospheric modeling — essentially a 'what if' scenario.The scientists calculated that gamma-ray radiation from a relatively nearby star explosion, hitting the Earth for only ten seconds, could deplete up to half of the atmosphere's protective ozone layer. Recovery could take at least five years. With the ozone layer damaged, ultraviolet radiation from the Sun could kill much of the life on land and near the surface of oceans and lakes, and disrupt the food chain.These scientists calculated the potential effect of ultraviolet radiation on life. Deep-sea creatures living several feet below water would be protected. Surface-dwelling plankton and other life near the surface, however, would not survive. Plankton is the foundation of the marine food chain.This visualization shows the regions of the planet most susceptible to DNA damage (shown in red) if a large gamma ray burst were to occur close to Earth.[This text is from the NASA web story on the subject. See the Story URL below.] || ",
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        {
            "id": 579,
            "url": "http://svs.gsfc.nasa.gov/579/",
            "result_type": "Visualization",
            "release_date": "1999-04-09T12:00:00-04:00",
            "title": "UARS: The Upper Atmosphere Research Satellite",
            "description": "This video summarizes science and data obtained by the Upper Atmosphere Research Satellite (UARS) mission.  UARS was launched in 1991 to study ozone depletion and the processes that control the stratospheric ozone layer.  Although the mission was intended to last only 18 months, UARS continued to operate 7.5 years after launch with 8 of the 10 instruments at the time this video was made. UARS has been one of the most successful NASA satellite programs. The spacecraft was developed and is managed by NASA's Goddard Space Flight Center. || ",
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        {
            "id": 842,
            "url": "http://svs.gsfc.nasa.gov/842/",
            "result_type": "Visualization",
            "release_date": "1999-04-09T12:00:00-04:00",
            "title": "UARS Voice Over",
            "description": "This entry represents the narration track for the UARS video (SVS animation 579).  This item is not available separately. || a000842_pre.jpg (320x238) [13.8 KB] || a000842_thm.png (80x40) [6.9 KB] || a000842_pre_searchweb.jpg (320x180) [88.0 KB] || Video slate image reads, \"The Upper Atmosphere Research SatelliteUARS Voice Over01:54:26:22 to 02:07:58:13\". || a000842_slate.jpg (720x528) [120.7 KB] || a000842_slate_web.png (320x234) [106.1 KB] || ",
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