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            "title": "Water on the Moon",
            "description": "Since the 1960’s, scientists have suspected that frozen water could survive in cold, dark craters at the Moon’s poles.  While previous lunar missions have detected hints of water on the Moon, new data from the Lunar Reconnaissance Orbiter (LRO) pinpoints areas near the south pole where water is likely to exist.  The key to this discovery is hydrogen, the main ingredient in water: LRO uses its Lunar Exploration Neutron Detector, or LEND, to measure how much hydrogen is trapped within the lunar soil.  By combining years of LEND data, scientists see mounting evidence of hydrogen-rich areas near the Moon’s south pole, strongly suggesting the presence of frozen water. || ",
            "release_date": "2013-06-03T11:00:00-04:00",
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                "alt_text": "LRO’s Lunar Exploration Neutron Detector (LEND) has accumulated new evidence of water at the south pole of the Moon.  By combining years of LEND data, scientists see a consistent pattern of hydrogen-rich soil thought to indicate the presence of frozen water.For complete transcript, click here.",
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            "page_type": "Visualization",
            "title": "LEND Looks for Water at the South Pole",
            "description": "Since Lunar Reconnaissance Orbiter (LRO) entered lunar orbit in 2009, its neutron detector, LEND, has been counting the neutrons coming from the Moon's surface.Neutrons are created when galactic cosmic rays strike atoms in the lunar regolith. These neutrons bounce from atom to atom like billiard balls, losing energy with each collision. Along the way, some of these neutrons escape into space, where LEND can detect them.The presence of hydrogen in the lunar soil reduces the number of neutrons that escape. To map out likely deposits of water ice, LEND scientists look for this deficit of neutrons in the epithermal (medium) energy range.If the deficit were simply due to random fluctuations, the hydrogen map would never coalesce into a sharp image, but as this animation shows, the map of epithermal neutron deficit at the south pole of the Moon improves over time and converges on particular spots. These include especially strong signals in the permanently shadowed parts of Cabeus and Shoemaker craters, where ice would be completely shielded from the sun. But LEND and other missions have found signs of water in places that aren't permanently shadowed while apparently excluding some places that are, both of which are surprising and exciting discoveries. || ",
            "release_date": "2013-03-25T00:00:00-04:00",
            "update_date": "2025-01-05T22:20:45.147058-05:00",
            "main_image": {
                "id": 467193,
                "url": "https://svs.gsfc.nasa.gov/vis/a000000/a004000/a004057/lend.2180_print.jpg",
                "filename": "lend.2180_print.jpg",
                "media_type": "Image",
                "alt_text": "We follow LRO to the south pole and watch as the LEND instrument integrates neutron counts over the three years from July 2009 to June 2012.This video is also available on our YouTube channel.",
                "width": 1024,
                "height": 576,
                "pixels": 589824
            }
        },
        {
            "id": 10743,
            "url": "https://svs.gsfc.nasa.gov/10743/",
            "page_type": "Produced Video",
            "title": "LEND: The Lunar Neutron Counter",
            "description": "How would you find out where to look for water on the Moon? NASA's Lunar Reconnaissance Orbiter has a unique answer: Count the neutrons coming from the Moon! By measuring the relative amounts of slow and fast neutrons coming from soil on the Moon, scientists think they can estimate the amount of hydrogen. And it's believed that where there's hydrogen, there might also be water! Find out more about LEND by watching this video. || ",
            "release_date": "2011-03-31T00:00:00-04:00",
            "update_date": "2023-05-03T13:53:51.016061-04:00",
            "main_image": {
                "id": 487302,
                "url": "https://svs.gsfc.nasa.gov/vis/a010000/a010700/a010743/lro_lend_video_ipod_lg.00727_print.jpg",
                "filename": "lro_lend_video_ipod_lg.00727_print.jpg",
                "media_type": "Image",
                "alt_text": "Learn more about LRO's LEND instrument here!For complete transcript, click here.",
                "width": 1024,
                "height": 576,
                "pixels": 589824
            }
        }
    ],
    "sources": [],
    "products": [],
    "newer_versions": [],
    "older_versions": [],
    "alternate_versions": []
}