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    "results": [
        {
            "id": 5023,
            "url": "https://svs.gsfc.nasa.gov/5023/",
            "result_type": "Visualization",
            "release_date": "2022-09-19T09:30:00-04:00",
            "title": "Lunar Polar Wander",
            "description": "The wandering path of the lunar South Pole is shown over a period from 4.25 billion years ago to the present.This video can also be viewed on the SVS YouTube channel. || tpw.0750_print.jpg (1024x576) [250.9 KB] || tpw.0750_searchweb.png (320x180) [109.2 KB] || tpw.0750_thm.png (80x40) [7.6 KB] || tpw_1080p30.mp4 (1920x1080) [46.9 MB] || tpw_720p30.mp4 (1280x720) [22.5 MB] || 1920x1080_16x9_30p (1920x1080) [0 Item(s)] || tpw_720p30.webm (1280x720) [5.6 MB] || tpw_360p30.mp4 (640x360) [8.1 MB] || tpw_1080p30.mp4.hwshow [177 bytes] || ",
            "hits": 129
        },
        {
            "id": 4619,
            "url": "https://svs.gsfc.nasa.gov/4619/",
            "result_type": "Visualization",
            "release_date": "2018-04-09T10:00:00-04:00",
            "title": "Tour of the Moon 4K Redux",
            "description": "The camera flies over the lunar terrain, coming in for close looks at a variety of interesting sites and some of the LRO data associated with them. Includes narration, music, feature titles, research sources, and the location and scale of the image center. Music Provided By Killer Tracks: \"Never Looking Back\" - Frederick Wiedmann. \"Flying over Turmoil\" - Benjamin Krause & Scott Goodman.Watch this video on the NASA Goddard YouTube channel.This video is also available on the SVS YouTube channel. || narrated.1000_print.jpg (1024x576) [197.1 KB] || moontour_narrated_1080p30.webm (1920x1080) [40.4 MB] || moontour_narrated_1080p30.mp4 (1920x1080) [458.9 MB] || moontour_narrated.en_US.srt [5.9 KB] || moontour_narrated.en_US.vtt [5.9 KB] || moontour_narrated_2160p30.mp4 (3840x2160) [1.4 GB] || moontour_narrated_2160p30_prores.mov (3840x2160) [18.1 GB] || ",
            "hits": 1052
        },
        {
            "id": 4499,
            "url": "https://svs.gsfc.nasa.gov/4499/",
            "result_type": "Visualization",
            "release_date": "2016-10-21T00:00:00-04:00",
            "title": "Orientale Impact Basin for the Cover of <i>Science</i>",
            "description": "This print-resolution still image was created for the cover of the October 28, 2016 issue of Science. It features a free-air gravity map of the Orientale impact basin based on data returned by the Gravity Recovery and Interior Laboratory (GRAIL) mission.Orientale is about 930 kilometers wide and lies on the western limb of the Moon as viewed from Earth. It's the Moon's youngest and best-preserved large impact basin, formed about 3.8 billion years ago at the end of the conjectured Late Heavy Bombardment. A paper in Science by Maria Zuber et al. uses the GRAIL data to shed new light on the basin's geology, while a second paper by Brandon Johnson et al. describes a computer simulation of the basin's formation constrained by that data.The shaded relief in this image is not a photograph. It's a very accurate computer rendering based on a digital model of the terrain. The model is derived from a digital elevation map called SLDEM2015. This map combines data from the laser altimeter (LOLA) on NASA's Lunar Reconnaissance Orbiter (LRO) with stereo imagery from the Terrain Camera on the Japan Space Agency's SELENE spacecraft.The angle of the virtual Sun was chosen to throw Orientale's terrain into high relief — it's just after sunrise at Orientale, about a day past full Moon. The camera is on the western terminator (day/night line) looking north.The colorful part is the gravity anomaly based on measurements by GRAIL. Red indicates areas of higher gravity, or excess mass, and blue indicates lower gravity or areas of mass deficits. The GRAIL data reveals the structure of the basin beneath the surface. The red in the center of the basin, for example, shows that the crust is particularly thin there, and that denser mantle material is closer to the surface. || ",
            "hits": 895
        },
        {
            "id": 4218,
            "url": "https://svs.gsfc.nasa.gov/4218/",
            "result_type": "Visualization",
            "release_date": "2014-10-01T00:00:00-04:00",
            "title": "Procellarum Rifts for the Cover of <i>Nature</i>",
            "description": "Oceanus Procellarum, or the Ocean of Storms, is the largest of the dark maria visible to the naked eye on the near side of the Moon. Its relatively flat surface of basaltic lava covers most of the northwest quadrant of the Moon's disk.The leading explanation of Procellarum's origin is that it is a large, ancient impact basin. But the authors of a paper in the October 2, 2014 edition of the journal Nature suggest instead that this region is the result of the way the lunar crust cooled billions of years ago.The red in the image shown here is part of a pattern of gravity anomalies revealed by data from the Gravity Recovery and Interior Laboratory (GRAIL) mission. Jeffrey Andrews-Hanna and his coathors interpret this rectangular feature as a remnant of the plumbing system that moved magma to the surface of the Moon's near side, flooding low-lying areas with lava.The rectangular shape differs from the circular shape expected for an impact basin. It more closely resembles the pattern of cracks that form in materials subjected to thermal stress. In fact, the paper compares the shape of the Procellarum gravity anomaly with a feature spanning the south pole of Enceladus, the ice-covered moon of Saturn. || ",
            "hits": 117
        },
        {
            "id": 4175,
            "url": "https://svs.gsfc.nasa.gov/4175/",
            "result_type": "Visualization",
            "release_date": "2014-06-17T00:00:00-04:00",
            "title": "GRAIL Gravity Map for the Cover of <i>Geophysical Research Letters</i>",
            "description": "This print-resolution still image was created for the cover of the May 28, 2014 issue of Geophysical Research Letters. It features a free-air gravity map of the Moon's southern latitudes developed by S. Goossens et al. from data returned by the Gravity Recovery and Interior Laboratory (GRAIL) mission.If the Moon were a perfectly smooth sphere of uniform density, the gravity map would be a single, featureless color, indicating that the force of gravity at a given elevation was the same everywhere. But like other rocky bodies in the solar system, including Earth, the Moon has both a bumpy surface and a lumpy interior. Spacecraft in orbit around the Moon experience slight variations in gravity caused by both of these irregularities.The free-air gravity map shows deviations from the mean gravity that a cueball Moon would have. The deviations are measured in milliGals, a unit of acceleration. On the map, purple is at the low end of the range, at around -400 mGals, and red is at the high end near +400 mGals. Yellow denotes the mean.The map shown here extends from the south pole of the Moon up to 50°S and reveals the gravity for that region in even finer detail than the global gravity maps published previously. The image illustrates the very good correlation between the gravity map and topographic features such as peaks and craters, as well as the mass concentration lying beneath the large Schrödinger basin in the center of the frame. The terrain in the image is based on Lunar Reconnaissance Orbiter (LRO) altimeter and camera data. || ",
            "hits": 92
        },
        {
            "id": 30475,
            "url": "https://svs.gsfc.nasa.gov/30475/",
            "result_type": "Hyperwall Visual",
            "release_date": "2013-11-01T12:00:00-04:00",
            "title": "GRAIL Creates Most Accurate Moon Gravity Map",
            "description": "This colorful image of Earth’s moon shows variations in the lunar gravity field, as measured by NASA’s twin Gravity Recovery and Interior Laboratory (GRAIL) satellites. Dark blue shades indicate areas that have a low local gravity, while red shades indicate areas that have a high degree of local gravity. The high-resolution gravity field map resolves spatial scales as fine as 13 kilometers (~8 miles) and reveals distinct lunar features including impact basins, complex craters, and simple craters. As the twin spacecraft move along the same orbit, they react to the mass of features on the surface below them (e.g., mountains and craters) as well as features hidden beneath the surface. In orbit, the two spacecraft transmit radio signals to define precisely the distance between them. Scientists translate this information into highly precise maps of gravity that allows them to learn about the moon's internal structure and composition, providing a better understanding of how Earth and other rocky planets in the solar system formed and evolved. After revealing much about the moon’s interior composition, GRAIL’s extremely successful primary mission ended in December 2012; unlike most missions, however, GRAIL went out with a bang. The twin spacecraft, called Ebb and Flow, were intentionally crashed into a mountain near the moon’s north pole to study the resulting dust cloud and learn more about the composition of the lunar surface.Used in 2014 Calendar. || ",
            "hits": 209
        },
        {
            "id": 4054,
            "url": "https://svs.gsfc.nasa.gov/4054/",
            "result_type": "Visualization",
            "release_date": "2013-03-19T13:00:00-04:00",
            "title": "LAMP Observes GRAIL Impact",
            "description": "The Gravity Recovery and Interior Laboratory (GRAIL) mission comprised a pair of satellites that together measured the gravity field of the Moon. GRAIL ended its mission with a planned impact into the side of a lunar mountain on December 17, 2012. Lunar Reconnaissance Orbiter (LRO) maneuvered into an orbit that would allow it to observe the impact. One of LRO's instruments, the Lyman-Alpha Mapping Project (LAMP), looked for the chemical signatures of a number of elements, including hydrogen and mercury, in the dust plume kicked up by the impact.This animation shows the relative positions of GRAIL and LRO at the time of the impact, as well as the view from LAMP as it scanned for the dust plume. The LAMP sensor is a 6.0° x 0.3° slit that was positioned to look over the limb of the Moon, so that it would be pointed into the tenuous dust plume with only the sky in the background. This observation was possible, in part, because GRAIL impacted on the night side of the Moon, where there was no concern that LAMP's sensitive detector could be blinded by sunlit terrain. From Earth, the Moon was a waxing crescent at the time of the impact. || ",
            "hits": 70
        },
        {
            "id": 4041,
            "url": "https://svs.gsfc.nasa.gov/4041/",
            "result_type": "Visualization",
            "release_date": "2013-02-08T00:00:00-05:00",
            "title": "GRAIL Free-Air Gravity Map for the Cover of <em>Science</em>",
            "description": "These print-resolution stills were created for the cover of the February 8, 2013 issue of Science. They show the free-air gravity map developed by the Gravity Recovery and Interior Laboratory (GRAIL) mission.If the Moon were a perfectly smooth sphere of uniform density, the gravity map would be a single, featureless color, indicating that the force of gravity at a given elevation was the same everywhere. But like other rocky bodies in the solar system, including Earth, the Moon has both a bumpy surface and a lumpy interior. Spacecraft in orbit around the Moon experience slight variations in gravity caused by both of these irregularities.The free-air gravity map shows deviations from the mean, the gravity that a cueball Moon would have. The deviations are measured in milliGals, a unit of acceleration. On the map, dark purple is at the low end of the range, at around -400 mGals, and red is at the high end near +400 mGals. Yellow denotes the mean.These views show a part of the Moon's surface that's never visible from Earth. They are centered on lunar coordinates 29°N 142°E. The large, multi-ringed impact feature near the center is Mare Moscoviense. The crater Mendeleev is south of this. The digital elevation model for the terrain is from the Lunar Reconnaissance Orbiter laser altimeter (LOLA). Merely for plausibility, the sun angle and starry background are accurate for specific dates (December 21, 2012, 0:00 UT and January 8, 2013, 14:00 UT, respectively). || ",
            "hits": 152
        },
        {
            "id": 4023,
            "url": "https://svs.gsfc.nasa.gov/4023/",
            "result_type": "Visualization",
            "release_date": "2012-12-17T09:00:00-05:00",
            "title": "GRAIL Impacts the Moon",
            "description": "The Gravity Recovery and Interior Laboratory (GRAIL) mission comprises a pair of satellites launched in September, 2011 and placed in orbit around the Moon in January, 2012. The two satellites, named Ebb and Flow, used radio signals to precisely measure their separation as they flew in formation, one following the other in the same nearly circular polar orbit. These measurements allowed mission scientists to build up an accurate and detailed gravity map of the Moon.GRAIL ends its successful mission by impacting the Moon on December 17, 2012 at approximately 5:27 p.m. EST (22:27 UT). The two spacecraft were placed in an orbit that takes them within a kilometer of the surface, so low that they will hit the side of an unnamed mountain that lies between Mouchez and Philolaus craters, near the north pole at 75°45'N, 26°11'W. Ebb strikes first, followed 24 seconds later by Flow.This animation shows the last three orbits of the two spacecraft, with views of the impact site. The impact occurs on the night side of a waxing crescent Moon, so the view shifts from a natural color Moon to a false-color elevation map. || ",
            "hits": 189
        },
        {
            "id": 4014,
            "url": "https://svs.gsfc.nasa.gov/4014/",
            "result_type": "Visualization",
            "release_date": "2012-12-05T12:00:00-05:00",
            "title": "GRAIL Primary Mission Gravity Maps (AGU 2012)",
            "description": "The Gravity Recovery and Interior Laboratory (GRAIL) mission comprises a pair of satellites launched in September, 2011 and placed in orbit around the Moon in January, 2012. The two satellites, named Ebb and Flow, used radio signals to precisely measure their separation as they flew in formation, one following the other in the same nearly circular polar orbit. These measurements allowed mission scientists to build up an accurate and detailed gravity map of the Moon.If the Moon were a perfectly smooth sphere of uniform density, the gravity experienced by the spacecraft would be exactly the same everywhere. But like other rocky bodies in the solar system, including the Earth, the Moon has both a bumpy surface and a lumpy interior. As the spacecraft fly in their orbits, they experience slight variations in gravity caused by both of these irregularities, variations which show up as small changes in the separation of the two spacecraft.The free-air gravity map shows these variations directly. (Free-air is a historical term; there is, of course, no air on the Moon.) The Bouguer gravity map subtracts the effect of the bumpy surface to show the lumpiness underneath. The elevation maps from the laser altimeter on Lunar Reconnaissance Orbiter (LRO) were used to create a model of what the gravity would be if the Moon were bumpy but not lumpy. This model was then subtracted from the free-air map to produce the Bouguer map. (Note: The Bouguer map shown here was filtered to emphasize smaller features; harmonic degrees 1 to 6 were excluded.)The crustal thickness map is inferred from the Bouguer map: If the density of the crust is assumed to be uniform, then the gravity anomalies visible in the Bouguer gravity map can be explained by variations in the thickness of the crust. Highs in gravity indicate places where the denser mantle is closer to the surface, and hence where the crust is thinner.While aiding navigation for future lunar missions, GRAIL's gravity measurements reveal information about the internal structure of the Moon, improving our understanding of the origin and development of not just the Moon, but also the Earth and the rest of the inner solar system. || ",
            "hits": 125
        }
    ]
}