{ "count": 12, "next": null, "previous": null, "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": 14121, "url": "https://svs.gsfc.nasa.gov/14121/", "result_type": "Produced Video", "release_date": "2022-03-29T11:00:00-04:00", "title": "The Geocenter of the Earth Is Changing (And Why That Matters)", "description": "Stock Footage: Pond5Universal Production Music: Kinda Frantic by Steve Rucker [ASCAP]This video can be freely shared and downloaded. While the video in its entirety can be shared without permission, some individual imagery provided by pond5.com is obtained through permission and may not be excised or remixed in other products. For more information on NASA’s media guidelines, visit https://www.nasa.gov/multimedia/guidelines/index.htmlComplete transcript available. || 14121_Geodesy.jpg (1920x1080) [538.3 KB] || 14121_Geodesy_searchweb.png (320x180) [94.1 KB] || 14121_Geodesy_thm.png (80x40) [5.9 KB] || 14121_Geocenter.mp4 (1920x1080) [252.5 MB] || 14121_Geocenter_TWITTER.mp4 (1280x720) [65.3 MB] || 14121_Geocenter_TWITTER.webm (1280x720) [26.6 MB] || 14121_Geocenter.webm (1920x1080) [26.9 MB] || 14121_Geocenter_en.us.en_US.srt [5.3 KB] || 14121_Geocenter_en.us.en_US.vtt [5.1 KB] || ", "hits": 42 }, { "id": 4778, "url": "https://svs.gsfc.nasa.gov/4778/", "result_type": "Visualization", "release_date": "2020-01-23T09:00:00-05:00", "title": "Earth Versus Proxima Centauri b Rotation Rates", "description": "Earth spins on its axis every 24 hours. Proxima B is tidally locked and therefore always faces it's star, much like how the moon has one side that always faces Earth. || near_evb.00333_print.jpg (1024x576) [88.2 KB] || near_evb.00333_searchweb.png (320x180) [55.2 KB] || near_evb.00333_thm.png (80x40) [5.5 KB] || Composite (1920x1080) [0 Item(s)] || near_evb_1080p30_2.webm (1920x1080) [72.6 MB] || near_evb_1080p30_2.mp4 (1920x1080) [367.4 MB] || ", "hits": 647 }, { "id": 3458, "url": "https://svs.gsfc.nasa.gov/3458/", "result_type": "Visualization", "release_date": "2017-10-01T00:00:00-04:00", "title": "Destination Asteroid", "description": "Not far from Earth, dark bodies of rock circle the sun in lonely orbits. These near Earth objects, or NEOs, are asteroids found outside the traditional belt between Mars and Jupiter. Protected from the gravitational tugs and tumbles that affect objects found closer to the gas giant, these asteroids may contain clues about the origins of the solar system. That's why experts from NASA and The University of Arizona want to send a research vehicle to collect a sample. That's OSIRIS. Once approved, the OSIRIS vehicle would leave Earth on a multi-year mission to map and collect samples from a particular NEO called RQ-36.In DESTINATION: ASTEROID, we look behind the scenes as a team of government scientists demonstrates for a visiting group of reporters how the mission will work. This short film explores the basics of the mission, including scientific goals, technical design plans, and a timeline of planned events. Imagination and invention meet in this spirited paean to NASA's legacy for great feats of exploration and discovery. Join us as we set our navigation systems to DESTINATION: ASTEROID. || ", "hits": 43 }, { "id": 4217, "url": "https://svs.gsfc.nasa.gov/4217/", "result_type": "Visualization", "release_date": "2014-10-08T00:00:00-04:00", "title": "Coordinated Earth: Measuring Space in the Near-Earth Environment", "description": "When we operate satellites in space, they are often taking measurements along the locations of their travel. As with many measurements, they are only useful if they can be placed in the proper context - their relationship to other measurements at the same, and different, locations. To assemble these measurements within context, we also need to know where and when the measurements were taken, and to do that, we need to define a coordinate system.In three-dimensional space, we define a position with three numbers, relative to a point we define as the Origin of the coordinate system, defined as (0,0,0). Each number represents a distance from the origin along one of three directions. We usually defined these directions by axes, labelled X, Y, and Z, which are defined to be mutually perpendicular, each one is at right angles to the others.While all coordinate systems are equal, all coordinate systems are not equally convenient for a given problem of interest. Sometimes the data and mathematics we use for exploring different problems can be more complex in one coordinate system or another. To simplify this, we often define a number of different coordinate systems and ways to do transformations between them.In studying the space environment around Earth, we find five different coordinate systems of use. Geocentric (GEO): This is the coordinate system useful for measuring things close to Earth’s surface. The origin is chosen at the center of Earth. The x-axis points from the center of Earth through the Prime Meridian (by convention chosen as the meridian in Greenwich, London, UK (longitude = 0). The z-axis points towards the north geographic pole. Geocentric Earth Inertial (GEI): This coordinate system is fixed relative to the distant stars, so Earth rotates about the z-axis relative to it. The origin of this coordinate system is at the center of the Earth. The x-axis points to the first point in Aries (Wikipedia: Vernal Equinox) and the z-axis points to the north geographic & celestial pole. The direction of the celestial pole changes due to Earth’s rotational precession (Wikipedia). Geocentric Solar Ecliptic (GSE): The origin is at the center of the Earth. The x-axis is along the line between Earth and the Sun. The z-axis is the north ecliptic pole and is fixed in direction (but for slow changes due to Earth orbital changes). Solar Magnetic (SM): the origin is at the center of the Earth. The z-axis is chosen parallel to the Earth magnetic dipole axis. The y-axis is chosen to be perpendicular to the z-axis and the Earth-Sun line (pointing towards dusk). Geocentric Solar Magnetospheric (GSM): The origin is at the center of the Earth. The x-axis is defined as the Earth-Sun line (same as in GSE). The y-axis is defined to be perpendicular to the plane containing the x-axis and the magnetic dipole axis so the magnetic axis always lies in this plane.Similar coordinate systems are defined for the Sun and other planets of the Solar System.Development Note: This visualization was originally developed to test coordinate system transformations in the visualization framework.References:C. T. Russell. \"Geophysical coordinate transformations\". Cosmical Electrodynamics 2, 184-196 (1971). URL.M.A. Hapgood. \"Space Physics Coordinate Transformations: A User Guide\". Planetary & Space Science, 40, 711-717.(1992). URLSPENVIS Help Pages: Coordinate Systems and transformations || ", "hits": 164 }, { "id": 20196, "url": "https://svs.gsfc.nasa.gov/20196/", "result_type": "Animation", "release_date": "2012-12-27T12:00:00-05:00", "title": "Earth Orientation Animations", "description": "When you think of the Earth's orientation, you'd probably imagine something like a globe, where it always rotates around an axis, called the spin axis, defined by the north and south poles. And while this generally makes sense, in reality, the Earth's orientation is constantly changing very slightly, and this change can be described in three ways. Learn more about how the Earth's orientation changes by watching the animations below!Note: All motion in these animations is greatly exaggerated for clarity. || ", "hits": 1257 }, { "id": 3830, "url": "https://svs.gsfc.nasa.gov/3830/", "result_type": "Visualization", "release_date": "2011-05-05T00:00:00-04:00", "title": "Aquarius Satellite & Data Pre-launch Beauty Shot", "description": "Aquarius is a focused satellite mission to measure global Sea Surface Salinity. After its planned 09-Jun-11 launch, it will provide the global view of salinity variability needed for climate studies. The Aquarius / SAC-D mission is being developed by NASA and the Space Agency of Argentina (Comision Nacional de Actividades Espaciales, CONAE). The satellite model depicted in this animation is an artist rendition and intentionally exaggerated so as to remain visible as it flies around the globe. Had the satellite model been rendered true-to-scale, it would not be visible when we pull out to see the full earth. || ", "hits": 33 }, { "id": 3818, "url": "https://svs.gsfc.nasa.gov/3818/", "result_type": "Visualization", "release_date": "2011-02-02T00:00:00-05:00", "title": "Earth Science Decadal Survey Missions", "description": "This animated graphic outlines the 15 NASA Earth science missions recommended by the National Research Council in its decadal survey report, published in 2007. These future missions will form the basis of a systematic space-based study of the Earth. For more information about the survey and the missions, see this NASA Science article, this decadal survey Web site, and the NRC's report. || ", "hits": 73 }, { "id": 3671, "url": "https://svs.gsfc.nasa.gov/3671/", "result_type": "Visualization", "release_date": "2010-01-14T12:00:00-05:00", "title": "Amazon Basin Monthly GRACE Data", "description": "This visualization displays monthly GRACE data in the Amazon basin. GRACE (Gravity Recovery and Climate Experiment) measures mass distribution and in this instance is used to demonstrate water storage and movement in the basin. Warmer colors like red and yellow reveal areas with greater mass, or more water, while cooler colors like blue and green indicate areas with lesser mass, or less water. || ", "hits": 70 }, { "id": 3655, "url": "https://svs.gsfc.nasa.gov/3655/", "result_type": "Visualization", "release_date": "2009-11-24T14:30:00-05:00", "title": "GRACE Gravity Model", "description": "The following animation displays the Earth's gravitational anomalies. The colors and heights represent the strength of gravity at the locality. Areas with less mass, such as ocean basins, show up as blue, that is less gravity, while mountains such as the Andes are red, representing the greater pull of gravity. The visualization utilizes a version of the GRACE Gravity Model 02 that has been smoothed for greater readability. || ", "hits": 445 }, { "id": 20081, "url": "https://svs.gsfc.nasa.gov/20081/", "result_type": "Animation", "release_date": "2006-09-18T00:00:00-04:00", "title": "Geodesy", "description": "To some extent, geodesy is the study of the shape of the Earth. But it is also the study of how to find precise locations on the planet. As it relates to the study of sea level, geodesy becomes vital. The Earth is not a perfect shape and is constantly changing. Only through a very carefully constructed system of analysis can scientists achieve the necessary accuracy about the planet's shape (the so-called 'geoid') to make measurements of sea level from space. In this animation we look at how a fleet of ground based lasers and the Global Positioning Satellite fleet contribute to a mathematically representative picture of the Earth. || ", "hits": 215 }, { "id": 2970, "url": "https://svs.gsfc.nasa.gov/2970/", "result_type": "Visualization", "release_date": "2004-08-05T12:00:00-04:00", "title": "Volumetric Visualization of the Convection-generated Stresses in Earth", "description": "The fundamental problem of the deformation of the Earth involves stress conditions on the basis of the crust caused by the mantle convection. Based on decades of satellite gravity data, a harmonic analytical model of the convection flow has been developed at GSFC. The magnitudes and directions of the resultant stresses in the crust were obtained at 64,000 grid points for each of 18 layers from 150 km to 600 km under the Earth. In this project, we explored three dimensional volumetric visualization methods for the data. To overcome the typical volumetric visualization obstacles such as enormous amount of data and opacity of objects in the scene, we developed an interactive and transparent isosurface model to render the volumetric data. a) Animated isosurfaces of earth stress below Hawaii. The blue objects indicate the shape of the stress distribution and the yellow objects indicate the high stress areas. b) Interactive global earth stress. To view the model, please use the QuickTime Player (similarly, please select the QuickTime version of the movie). Hold the left button and drag the mouse horizontally to view areas on the earth at the same depth. Hold the left button and drag the mouse vertically to view the different layers of the stress distributions inside the earth, between 150 km to 600 km deep. || ", "hits": 35 } ] }