{
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    "results": [
        {
            "id": 4986,
            "url": "https://svs.gsfc.nasa.gov/4986/",
            "result_type": "Visualization",
            "release_date": "2022-03-29T11:00:00-04:00",
            "title": "Space Geodesy Project",
            "description": "NASA's Space Geodesy Project (SGP) uses a variety of space- and land-based techniques to determine the precise shape, position, and orientation of the Earth with respect to the Terrestrial Reference Frame (TRF) and Earth orientation parameters (EOP). This visualization presents a summary of these techniques.The visualization begins with a shot of natural-looking Earth, then transitions to a view that shows the orbital components of the SGP, which include global navigation satellite systems (GNSS), satellite laser ranging (SLR) and Doppler Orbitography by Radiopositioning Integrated on Satellite (DORIS). The view then moves to the surface of the Earth, showing the positions and direction of the motion of ground stations as measured by these techniques, as well by ground-based very long baseline interferometry (VLBI), which uses the radio emissions of distant quasars to determine geodetic measurements.We then zoom into the center of the Earth to show the consequence of these surface motions: the movement of the geocenter, which these techniques can determine to within millimeters. || ",
            "hits": 98
        },
        {
            "id": 40348,
            "url": "https://svs.gsfc.nasa.gov/gallery/esddatafor-societal-benefits/",
            "result_type": "Gallery",
            "release_date": "2018-04-24T00:00:00-04:00",
            "title": "ESD data for Societal Benefit",
            "description": "No description available.",
            "hits": 168
        },
        {
            "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": 1090
        },
        {
            "id": 11031,
            "url": "https://svs.gsfc.nasa.gov/11031/",
            "result_type": "Produced Video",
            "release_date": "2012-07-05T07:00:00-04:00",
            "title": "Space Geodesy Profiles",
            "description": "Scientists from NASA's Space Geodesy Project discuss the techniques they use to precisely measure the Earth's position in the universe, determine the Earth's center of mass, calibrate satellites, observe sea level rise, and track the movements of the tectonic plates. || ",
            "hits": 30
        },
        {
            "id": 10964,
            "url": "https://svs.gsfc.nasa.gov/10964/",
            "result_type": "Produced Video",
            "release_date": "2012-06-21T09:00:00-04:00",
            "title": "Using Quasars to Measure the Earth: A Brief History of VLBI",
            "description": "VLBI, or Very Long Baseline Interferometry, is a technique that uses multiple radio telescopes to very precisely measure the Earth's orientation. It was originally invented back in the 1960s to take better pictures of quasars, but scientists soon found out that if you threw the process in reverse, you could measure how the ground beneath the telescopes moves around, how long days really are, and how the Earth wobbles on its axis as it revolves around the sun! Learn more about VLBI here!This video is presented in both stereoscopic 3D and standard 2D versions. The labels below will help you pick which video is right for your display! || ",
            "hits": 74
        },
        {
            "id": 10807,
            "url": "https://svs.gsfc.nasa.gov/10807/",
            "result_type": "Produced Video",
            "release_date": "2011-08-24T13:00:00-04:00",
            "title": "NASA's Swift Satellite Spots Black Hole Devouring A Star",
            "description": "In late March 2011, NASA's Swift satellite alerted astronomers to intense and unusual high-energy flares from a new source in the constellation Draco. They soon realized that the source, which is now known as Swift J1644+57, was the result of a truly extraordinary event — the awakening of a distant galaxy's dormant black hole as it shredded and consumed a star. The galaxy is so far away that the radiation from the blast has traveled 3.9 billion years before reaching Earth. Most galaxies, including our own, possess a central supersized black hole weighing millions of times the sun's mass. According to the new studies, the black hole in the galaxy hosting Swift J1644+57 may be twice the mass of the four-million-solar-mass black hole lurking at the center of our own Milky Way galaxy. As a star falls toward a black hole, it is ripped apart by intense tides. The gas is corralled into a disk that swirls around the black hole and becomes rapidly heated to temperatures of millions of degrees. The innermost gas in the disk spirals toward the black hole, where rapid motion and magnetism creates dual, oppositely directed \"funnels\" through which some particles may escape. Particle jets driving matter at velocities greater than 80-90 percent the speed of light form along the black hole's spin axis. In the case of Swift J1644+57, one of these jets happened to point straight at Earth.Theoretical studies of tidally disrupted stars suggested that they would appear as flares at optical and ultraviolet energies. The brightness and energy of a black hole's jet is greatly enhanced when viewed head-on. The phenomenon, called relativistic beaming, explains why Swift J1644+57 was seen at X-ray energies and appeared so strikingly luminous. When first detected on March 28, the flares were initially assumed to signal a gamma-ray burst, one of the nearly daily short blasts of high-energy radiation often associated with the death of a massive star and the birth of a black hole in the distant universe. But as the emission continued to brighten and flare, astronomers realized that the most plausible explanation was the tidal disruption of a sun-like star seen as beamed emission. || ",
            "hits": 271
        }
    ]
}