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        {
            "id": 14969,
            "url": "https://svs.gsfc.nasa.gov/14969/",
            "result_type": "Produced Video",
            "release_date": "2026-03-05T11:00:00-05:00",
            "title": "Introducing NASA's Roman Space Telescope",
            "description": "Named after NASA’s first chief astronomer, the ‘mother of the Hubble Space Telescope,’ the Nancy Grace Roman Space Telescope will have a field of view at least 100 times larger than Hubble's, potentially measuring light from a billion galaxies in its lifetime. This observatory will also be able to block starlight to directly see exoplanets and planet-forming disks, complete a statistical census of planetary systems in our galaxy, and settle essential questions in the areas of dark energy, dark matter, and infrared astrophysics.Music credit: “Fire,” by Frederick Helmut Wiedmann [GMR], Universal Production MusicWatch this video on the NASA Goddard YouTube channel.Complete transcript available. || YTframe_RomanShortOverview3.jpg (1280x720) [222.3 KB] || YTframe_RomanShortOverview3_searchweb.png (320x180) [80.5 KB] || YTframe_RomanShortOverview3_thm.png (80x40) [9.6 KB] || 14969_Roman_Short_Overview_Good.mp4 (1920x1080) [109.7 MB] || 14969_Roman_Short_Overview_Best.mp4 (1920x1080) [215.6 MB] || 14969_Roman_Short_Overview_YT.mp4 (1920x1080) [523.0 MB] || 14969RomanShortOverviewCaptions.en_US.srt [2.1 KB] || 14969RomanShortOverviewCaptions.en_US.vtt [2.0 KB] || 14969_Roman_Short_Overview_ProRes_1920x1080_29.97.mov (1920x1080) [1.4 GB] || ",
            "hits": 628
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        {
            "id": 14891,
            "url": "https://svs.gsfc.nasa.gov/14891/",
            "result_type": "Produced Video",
            "release_date": "2026-01-20T11:00:00-05:00",
            "title": "Far and Wide: Roman and Webb's Overlapping Roles in Understanding Our Universe",
            "description": "The four Roman/Webb Far and Wide videos that detail the differences between the two missions, why we need both, what they will do and how they will work together.",
            "hits": 322
        },
        {
            "id": 14935,
            "url": "https://svs.gsfc.nasa.gov/14935/",
            "result_type": "Infographic",
            "release_date": "2025-12-18T13:00:00-05:00",
            "title": "Milky Way Anatomy",
            "description": "This infographic with artist’s concept views of our Milky Way galaxy highlights its main components: the disk, bulge, stellar halo, and dark matter halo. Scientists have a pretty good idea of the Milky Way’s overall structure, but since we’re nestled inside it, fine details are hard to see. Astronomers have used observations from different telescopes to piece together our galaxy's anatomy, and future observatories like NASA's Nancy Grace Roman Space Telescope will make the picture even clearer. || Milky_Way_Anatomy_Infographic_Simple_Final_print.jpg (1024x512) [118.4 KB] || Milky_Way_Anatomy_Infographic_Simple_Final.jpg (4320x2160) [1.2 MB] || Milky_Way_Anatomy_Infographic_Simple_Final.png (4320x2160) [6.5 MB] || Milky_Way_Anatomy_Infographic_Simple_Final_searchweb.png (320x180) [68.0 KB] || Milky_Way_Anatomy_Infographic_Simple_Final_thm.png (80x40) [5.1 KB] || ",
            "hits": 1844
        },
        {
            "id": 14820,
            "url": "https://svs.gsfc.nasa.gov/14820/",
            "result_type": "Infographic",
            "release_date": "2025-04-24T12:00:00-04:00",
            "title": "Roman's Core Surveys Infographics",
            "description": "NASA’s Nancy Grace Roman Space Telescope’s three main observing programs, highlighted in this infographic, will enable astronomers to view the universe as never before, revealing billions of cosmic objects strewn across enormous swaths of space-time.Credit: NASA’s Goddard Space Flight Center || Roman_CoreSurveys_Infographic_print.jpg (1024x640) [155.3 KB] || Roman_CoreSurveys_Infographic.png (8000x5000) [28.6 MB] || Roman_CoreSurveys_Infographic.jpg (8000x5000) [2.5 MB] || Roman_CoreSurveys_Infographic_Half.jpg (4000x2500) [1.3 MB] || Roman_CoreSurveys_Infographic_searchweb.png (320x180) [72.9 KB] || Roman_CoreSurveys_Infographic_thm.png [6.6 KB] || ",
            "hits": 329
        },
        {
            "id": 14301,
            "url": "https://svs.gsfc.nasa.gov/14301/",
            "result_type": "Produced Video",
            "release_date": "2023-03-08T10:00:00-05:00",
            "title": "Millions of Galaxies Emerge in New Simulated Images From NASA's Roman",
            "description": "This video begins by showing the most distant galaxies in the simulated deep field image in red. As it zooms out, layers of nearer (yellow and white) galaxies are added to the frame. By studying different cosmic epochs, Roman will be able to trace the universe's expansion history, study how galaxies developed over time, and much more.Credit: Caltech-IPAC/R. Hurt and M. Troxel || Roman_Zoom_still.jpg (1920x1080) [515.9 KB] || Roman_Zoom_still_searchweb.png (320x180) [106.4 KB] || Roman_Zoom_still_thm.png (80x40) [6.6 KB] || Roman_Zoom-HD2K.mp4 (1920x1080) [25.3 MB] || Roman_Zoom-HD2K.webm (1920x1080) [2.7 MB] || ",
            "hits": 87
        },
        {
            "id": 14174,
            "url": "https://svs.gsfc.nasa.gov/14174/",
            "result_type": "Produced Video",
            "release_date": "2022-07-05T00:00:00-04:00",
            "title": "Rebekah Hounsell 2022 AAS Roman Hyperwall Talk",
            "description": "Title slide.Credit: NASA's Goddard Space Flight Center || rebekah_hounsell_roman_title_print.jpg (1024x576) [250.4 KB] || rebekah_hounsell_roman_title.png (3840x2160) [10.3 MB] || rebekah_hounsell_roman_title_searchweb.png (320x180) [111.8 KB] || rebekah_hounsell_roman_title_thm.png (80x40) [8.1 KB] || ",
            "hits": 74
        },
        {
            "id": 14175,
            "url": "https://svs.gsfc.nasa.gov/14175/",
            "result_type": "Produced Video",
            "release_date": "2022-07-05T00:00:00-04:00",
            "title": "Expanding Our View (2022 STScI presentation)",
            "description": "Complete PowerPoint file with all slides and notes || PPT_still.jpg (3840x2160) [750.6 KB] || roman-expanding-our-view-presentation.pptx [76.2 MB] || Slide #1 – Onscreen before presentation begins and during introductionCredit: STScI, NASA || Slide1_print.jpg (1024x576) [98.1 KB] || Slide1.png (3840x2160) [3.4 MB] || Slide1.jpg (3840x2160) [750.6 KB] || Slide1_searchweb.png (320x180) [63.9 KB] || Slide1_thm.png (80x40) [5.6 KB] || ",
            "hits": 59
        },
        {
            "id": 13872,
            "url": "https://svs.gsfc.nasa.gov/13872/",
            "result_type": "Produced Video",
            "release_date": "2021-06-17T10:55:00-04:00",
            "title": "Mystery of Galaxy's Missing Dark Matter Deepens",
            "description": "When astronomers using NASA’s Hubble Space Telescope uncovered an oddball galaxy that looks like it doesn’t have much dark matter, some thought the finding was hard to believe and looked for a simpler explanation. Dark matter, after all, is the invisible glue that makes up the bulk of the universe’s contents. All galaxies are dominated by it; in fact, galaxies are thought to form inside immense halos of dark matter. So, finding a galaxy lacking the invisible stuff is an extraordinary claim that challenges conventional wisdom. It would have the potential to upset theories of galaxy formation and evolution.For more information, visit https://nasa.gov/hubble. Additional Visualizations:Galaxy Motion Simulation: Credit: ESO/L. Calçada.Dark Matter Simulation: Credit: Additional Visualizations:Galaxy Motion Simulation: Credit: ESO/L. Calçada.Dark Matter Simulation: Credit: Wu, Hahn, Wechsler, Abel(KIPAC), Visualization: Kaehler (KIPAC)Music Credits: \"Aphelion Horizon\" by Alistair Hetherington [PRS] via Atmosphere Music Ltd. [PRS], and Universal Production Music. || ",
            "hits": 218
        },
        {
            "id": 13713,
            "url": "https://svs.gsfc.nasa.gov/13713/",
            "result_type": "Produced Video",
            "release_date": "2020-09-10T14:00:00-04:00",
            "title": "Hubble Makes Unexpected Dark Matter Discovery",
            "description": "Astronomers seem to have revealed a puzzling detail in the way dark matter behaves. They found small, dense concentrations of dark matter that bend and magnify light much more strongly than expected.For more information, visit  https://nasa.gov/hubble.Visualizations and Additional Footage:ESA/Hubble — Gravitational Lensing AnimationESA/Hubble — Gravitational Lensing Simplified VisualizationR. Wesson/ESO — Very Large Telescope FootageMusic Credits:“On the Path” by Bernhard Hering [GEMA] and Matthias Kruger [GEMA] via Berlin Production Music/Universal Production Music GmbH [GEMA] || ",
            "hits": 102
        },
        {
            "id": 13606,
            "url": "https://svs.gsfc.nasa.gov/13606/",
            "result_type": "Produced Video",
            "release_date": "2020-05-20T11:00:00-04:00",
            "title": "A New Portrait of the Cosmos is Coming",
            "description": "Welcome to NASA's upcoming infrared survey mission, taking a wider view of the cosmos.Credit: NASA's Goddard Space Flight CenterMusic: \"The Decision (alternate)\" from Universal Production MusicWatch this video on the NASA Goddard YouTube channel.Complete transcript available. || Trailer_still_1_print.jpg (1024x576) [181.5 KB] || Trailer_still_1.jpg (3840x2160) [2.0 MB] || Trailer_still_1_searchweb.png (180x320) [104.8 KB] || Trailer_still_1_thm.png (80x40) [7.9 KB] || Roman_Space_Telescope_Trailer_ProRes_1920x1080_2997.mov (1920x1080) [797.0 MB] || Roman_Space_Telescope_Trailer_Best_1080.mp4 (1920x1080) [281.5 MB] || Roman_Space_Telescope_Trailer_1080.mp4 (1920x1080) [132.9 MB] || Roman_Space_Telescope_Trailer_1080.webm (1920x1080) [7.2 MB] || Roman_Trailer_SRT_Captions.en_US.srt [740 bytes] || Roman_Trailer_SRT_Captions.en_US.vtt [753 bytes] || ",
            "hits": 53
        },
        {
            "id": 13607,
            "url": "https://svs.gsfc.nasa.gov/13607/",
            "result_type": "Produced Video",
            "release_date": "2020-05-20T11:00:00-04:00",
            "title": "NASA's Nancy Grace Roman Space Telescope: Broadening Our Cosmic Horizons",
            "description": "Learn about the Nancy Grace Roman Space Telescope.Credit: NASA's Goddard Space Flight CenterMusic: \"Climb the Ladder\" from Universal Production MusicWatch this video on the NASA Goddard YouTube channel.Complete transcript available. || Roman_Space_Telescope_Still_4.jpg (1920x1080) [166.9 KB] || Roman_Space_Telescope_Still_4_print.jpg (1024x576) [45.8 KB] || Roman_Space_Telescope_Still_4_searchweb.png (320x180) [39.6 KB] || Roman_Space_Telescope_Still_4_thm.png (80x40) [3.9 KB] || Roman_Space_Telescope_Overview_ProRes_1920x1080_2997.mov (1920x1080) [2.2 GB] || Roman_Space_Telescope_Overview_Best_1080.mp4 (1920x1080) [701.8 MB] || Roman_Space_Telescope_Overview_1080.mp4 (1920x1080) [249.0 MB] || Roman_Space_Telescope_Overview_1080.webm (1920x1080) [18.3 MB] || Roman_Overview_SRT_Captions.en_US.srt [3.0 KB] || Roman_Overview_SRT_Captions.en_US.vtt [3.0 KB] || ",
            "hits": 90
        },
        {
            "id": 12907,
            "url": "https://svs.gsfc.nasa.gov/12907/",
            "result_type": "Produced Video",
            "release_date": "2018-03-28T12:55:00-04:00",
            "title": "Hubble Views a Galaxy Lacking Dark Matter",
            "description": "NASA's Hubble Space Telescope took an image of a bizarre, ghostly looking galaxy called NGC 1052-DF2 that astronomers calculate to have little to no dark matter. This is the first galaxy astronomers have discovered to be so lacking in dark matter, which is thought to comprise 85% of our universe's mass.Read the full story at nasa.gov.Download the release images at HubbleSite.org.Find the science paper at nature.com. || ",
            "hits": 139
        },
        {
            "id": 12238,
            "url": "https://svs.gsfc.nasa.gov/12238/",
            "result_type": "Produced Video",
            "release_date": "2017-12-22T13:00:00-05:00",
            "title": "WFIRST Will See the Big Picture of the Universe",
            "description": "Learn about the Wide Field Infrared Survey Telescope (WFIRST) mission.Music: \"We Dissolve in Stars\" and \"Climb the Ladder\" both from Killer Tracks.Watch this video on the NASA Goddard YouTube channel.Complete transcript available. || WFIRST_Beauty_still_print.jpg (1024x576) [97.2 KB] || WFIRST_Beauty_still.png (3840x2160) [36.5 MB] || WFIRST_Beauty_still.jpg (3840x2160) [988.6 KB] || WFIRST_Beauty_still_searchweb.png (320x180) [72.0 KB] || WFIRST_Beauty_still_thm.png (80x40) [5.1 KB] || YOUTUBE_1080_12238_WFIRST_Overview_V3_FINAL.mp4 (1920x1080) [845.8 MB] || 12238_WFIRST_Overview_V3_H264_1080p.mov (1920x1080) [759.1 MB] || 12238_WFIRST_Overview_V3_H264_1080_2997.m4v (1920x1080) [377.3 MB] || 12238_WFIRST_Overview_V3_H264_1080p.webm (1920x1080) [41.2 MB] || 12238_WFIRST_Overview_V3_ProRes_3840x2160_2997.mov (3840x2160) [19.3 GB] || YOUTUBE_HQ_12238_WFIRST_Overview_V3_FINAL_4k.mov (3840x2160) [6.5 GB] || 12238_WFIRST_Overview_V3_H264_4K.mov (3840x2160) [1.1 GB] || WFIRST_overview_SRT_Captions.en_US.srt [6.7 KB] || WFIRST_overview_SRT_Captions.en_US.vtt [6.4 KB] || ",
            "hits": 78
        },
        {
            "id": 12505,
            "url": "https://svs.gsfc.nasa.gov/12505/",
            "result_type": "Produced Video",
            "release_date": "2017-02-21T14:00:00-05:00",
            "title": "Fermi Detects Gamma-ray Puzzle from M31",
            "description": "NASA's Fermi telescope has detected a gamma-ray excess at the center of the Andromeda Galaxy that's similar to a signature Fermi previously detected at the center of our own Milky Way. Watch to learn more. Credit: NASA's Goddard Space Flight Center/Scott Wiessinger, producerMusic: \"Lost Time\" from Killer TracksWatch this video on the NASA Goddard YouTube channel.Complete transcript available. || 12505_Fermi_M31_FINAL_appletv.00382_print.jpg (1024x576) [172.8 KB] || Fermi_M31_Still_searchweb.png (320x180) [92.6 KB] || Fermi_M31_Still_thm.png (80x40) [5.9 KB] || 12505_Fermi_M31_ProRes_1920x1080_2997.mov (1920x1080) [1.1 GB] || 12505_Fermi_M31_FINAL_youtube_hq.mov (1920x1080) [674.5 MB] || 12505_Fermi_M31_1080p.mov (1920x1080) [128.2 MB] || 12505_Fermi_M31_Good_1080.m4v (1920x1080) [85.0 MB] || 12505_Fermi_M31_FINAL_appletv.m4v (1280x720) [41.7 MB] || 12505_Fermi_M31_Compatible.m4v (960x540) [34.7 MB] || WMV_12505_Fermi_M31_FINAL_HD.wmv (1920x1080) [205.4 MB] || 12505_Fermi_M31_FINAL_appletv_subtitles.m4v (1280x720) [41.7 MB] || 12505_Fermi_M31_Compatible.webm (960x540) [9.0 MB] || 12505_Fermi_M31_SRT_Captions.en_US.srt [854 bytes] || 12505_Fermi_M31_SRT_Captions.en_US.vtt [867 bytes] || ",
            "hits": 74
        },
        {
            "id": 12307,
            "url": "https://svs.gsfc.nasa.gov/12307/",
            "result_type": "Produced Video",
            "release_date": "2016-09-20T14:00:00-04:00",
            "title": "Content of the Universe Pie Chart",
            "description": "Animated pie chart showing rounded values for the three known components of the universe: normal matter, dark matter, and dark energy. || frame-000215_print.jpg (1024x576) [103.0 KB] || frame-000215.jpg (5760x3240) [1.6 MB] || frame-000215_searchweb.png (320x180) [57.5 KB] || frame-000215_thm.png (80x40) [4.7 KB] || Dark_Energy_Pie_Updated_Fast_5k-HD_1080p.mov (1920x1080) [27.0 MB] || Dark_Energy_Pie_Updated_Fast_5k-HD_1080p.webm (1920x1080) [1.4 MB] || Fast (5760x3240) [0 Item(s)] || Dark_Energy_Pie_Updated_Fast_5k-4K.mov (4096x2304) [35.9 MB] || Dark_Energy_Pie_Updated_Fast_ProRes_5k.mov (5760x3240) [1.8 GB] || ",
            "hits": 1253
        },
        {
            "id": 20244,
            "url": "https://svs.gsfc.nasa.gov/20244/",
            "result_type": "Animation",
            "release_date": "2016-09-20T14:00:00-04:00",
            "title": "Dark Matter Gravitational Lensing Animation",
            "description": "Animation illustrating light from a cluster of galaxies being lensed by dark matter. || GravLens_fr_00168_print.jpg (1024x576) [59.0 KB] || GravLens_fr_00168.png (3840x2160) [3.1 MB] || GravLens_fr_00168_searchweb.png (320x180) [43.7 KB] || GravLens_fr_00168_thm.png (80x40) [4.4 KB] || GravLens_H2641080p.mov (1920x1080) [27.1 MB] || GravLens_H2641080p.webm (1920x1080) [1.7 MB] || 3840x2160_16x9_30p (3840x2160) [0 Item(s)] || GravLens_H264_4K.mov (3840x2160) [35.4 MB] || GravLens_4k_ProRes.mov (3840x2160) [1.4 GB] || ",
            "hits": 217
        },
        {
            "id": 12153,
            "url": "https://svs.gsfc.nasa.gov/12153/",
            "result_type": "Produced Video",
            "release_date": "2016-02-18T11:00:00-05:00",
            "title": "WFIRST: The Best of Both Worlds",
            "description": "With a view 100 times bigger than that of NASA’s Hubble Space Telescope, the Wide Field Infrared Survey Telescope WFIRST will aid researchers in their efforts to unravel the secrets of dark energy and dark matter, and explore the evolution of the cosmos. It also will discover new worlds outside our solar system and advance the search for worlds that could be suitable for life.  Scientists participating in the mission discuss the spacecraft, the science, and its potential.  Slated to launch in the mid-2020s, the observatory will operate at a gravitational balance point known as Earth-sun L2, which is located about 930,000 miles from Earth and directly opposite the sun.Watch this video on the NASA Goddard YouTube channel.Complete transcript available. || WfirstAfta-PrintStill2_print.jpg (1024x576) [79.3 KB] || WfirstAfta-PrintStill2.png (3840x2160) [4.7 MB] || WfirstAfta-PrintStill2_searchweb.png (320x180) [59.2 KB] || WfirstAfta-PrintStill2_thm.png (80x40) [4.6 KB] || 12153_WFIRST_Best_Both_Worlds_ProRes_1280x720_5994.mov (1280x720) [3.1 GB] || 12153_WFIRST_Best_Both_Worlds_H264_Best_1280x720_5994.mov (1280x720) [1.7 GB] || 12153_WFIRST_Best_Both_Worlds_FINAL_youtube_hq.mov (1280x720) [671.5 MB] || 12153_WFIRST_Best_Both_Worlds_H264_Good_1280x720_2997.mov (1280x720) [174.0 MB] || 12153_WFIRST_Best_Both_Worlds_FINAL_appletv.m4v (1280x720) [122.3 MB] || 12153_WFIRST_Best_Both_Worlds_H264_Good_1280x720_2997.webm (1280x720) [25.0 MB] || 12153_WFIRST_Best_Both_Worlds_FINAL_appletv_subtitles.m4v (1280x720) [122.4 MB] || 12153_WFIRST_BestBoth_SRT_Captions.en_US.srt [4.6 KB] || 12153_WFIRST_BestBoth_SRT_Captions.en_US.vtt [4.4 KB] || NASA_PODCAST_12153_WFIRST_Best_Both_Worlds_FINAL_ipod_sm.mp4 (320x240) [41.6 MB] || ",
            "hits": 54
        },
        {
            "id": 4183,
            "url": "https://svs.gsfc.nasa.gov/4183/",
            "result_type": "Visualization",
            "release_date": "2015-06-23T14:00:00-04:00",
            "title": "Capturing Dark Matter with Black Holes",
            "description": "In this visualization, we plot the trajectories of random-distribution of hypothesized dark matter particles around a maximally-rotating black hole.  The particles captured by the hole are seen collecting around the event horizon in the center, the particles experiencing stronger and stronger redshift, respresented by the stronger red coloration of the particle trail.The ergosphere is represented by the bluish oblate spheroid shape around the spherical event horizon.  Inside the ergosphere, the distortion of space is so strong that particles must be deflected and carried with the rotation of the black hole.  Hence, while the particles are traveling all different directions far from the black hole, we see them carried in the same direction close to the event horizon. || ",
            "hits": 333
        },
        {
            "id": 11894,
            "url": "https://svs.gsfc.nasa.gov/11894/",
            "result_type": "Produced Video",
            "release_date": "2015-06-23T14:00:00-04:00",
            "title": "Turning Black Holes into Dark Matter Labs",
            "description": "This video introduces a new computer simulation exploring the connection between two of the most elusive phenomena in the universe, black holes and dark matter. In the visualization, dark matter particles are gray spheres attached to shaded trails representing their motion. Redder trails indicate particles more strongly affected by the black hole's gravitation and closer to its event horizon (black sphere at center, mostly hidden by trails). The ergosphere, where all matter and light must follow the black hole's spin, is shown in teal. Watch this video on the NASA Goddard YouTube channel.Credit: NASA's Goddard Space Flight CenterFor complete transcript, click here. || DMBH_Still.jpg (1920x1080) [555.7 KB] || 11894_Dark_Matter_Black_Hole_H264_Good_1920x1080_2997.webm (1920x1080) [25.0 MB] || 11894_Dark_Matter_Black_Hole_ProRes_1920x1080_2997.mov (1920x1080) [3.1 GB] || 11894_Dark_Matter_Black_Hole_MPEG4_1920X1080_2997.mp4 (1920x1080) [135.4 MB] || 11894_Dark_Matter_Black_Hole_H264_Best_1920x1080_2997.mov (1920x1080) [2.1 GB] || 11894_Dark_Matter_Black_Hole_H264_Good_1920x1080_2997.mov (1920x1080) [356.2 MB] || G2015-040_Dark_Matter_Black_Hole_appletv.m4v (960x540) [93.0 MB] || G2015-040_Dark_Matter_Black_Hole_1280x720.wmv (1280x720) [103.5 MB] || G2015-040_Dark_Matter_Black_Hole_appletv_subtitles.m4v (960x540) [92.9 MB] || G2015-040_Dark_Matter_Black_Hole_ipod_lg.m4v (640x360) [37.6 MB] || 11894_Dark_Matter_Black_Hole_SRT_Captions.en_us.en_US.srt [4.2 KB] || 11894_Dark_Matter_Black_Hole_SRT_Captions.en_us.en_US.vtt [4.2 KB] || G2015-040_Dark_Matter_Black_Hole_ipod_sm.mp4 (320x240) [20.1 MB] || ",
            "hits": 253
        },
        {
            "id": 11513,
            "url": "https://svs.gsfc.nasa.gov/11513/",
            "result_type": "Produced Video",
            "release_date": "2014-04-03T11:00:00-04:00",
            "title": "Fermi Hints at Dark Matter",
            "description": "Using public data from NASA's Fermi Gamma-ray Space Telescope, independent scientists at the Fermi National Accelerator Laboratory, Harvard University, MIT and the University of Chicago have developed new maps showing that the galactic center produces more high-energy gamma rays than can be explained by known sources and that this excess emission is consistent with some forms of dark matter. No one knows the true nature of dark matter, but WIMPs, or Weakly Interacting Massive Particles, represent a leading class of candidates. Theorists have envisioned a wide range of WIMP types, some of which may either mutually annihilate or produce an intermediate, quickly decaying particle when they collide. Both of these pathways end with the production of gamma rays — the most energetic form of light — at energies within the detection range of Fermi's Large Area Telescope (LAT).The galactic center teems with gamma-ray sources, from interacting binary systems and isolated pulsars to supernova remnants and particles colliding with interstellar gas. It's also where astronomers expect to find the galaxy's highest density of dark matter, which only affects normal matter and radiation through its gravity. Large amounts of dark matter attract normal matter, forming a foundation upon which visible structures, like galaxies, are built. When the astronomers carefully subtract all known gamma-ray sources from LAT observations of the galactic center, a patch of leftover emission remains. This excess appears most prominent at energies between 1 and 3 billion electron volts (GeV) — roughly a billion times greater than that of visible light — and extends outward at least 5,000 light-years from the galactic center. The researchers find these features difficult to reconcile with other explanations proposed, such as undiscovered pulsars. The gamma-ray spectrum of the excess, its symmetry around the galactic center and its overall brightness, is, however, consistent with annihilations of dark matter particles in the mass range of 31 and 40 GeV. The scientists note that discoveries in other astronomical objects, such as dwarf galaxies, and experiments on Earth designed to directly detect dark matter particles will be needed to confirm this interpretation. For more information: Fermi Data Tantalize With New Clues To Dark Matter || ",
            "hits": 75
        },
        {
            "id": 10943,
            "url": "https://svs.gsfc.nasa.gov/10943/",
            "result_type": "Produced Video",
            "release_date": "2012-04-02T12:30:00-04:00",
            "title": "Fermi Observations of Dwarf Galaxies Provide New Insights on Dark Matter",
            "description": "There's more to the cosmos than meets the eye. About 80 percent of the matter in the universe is invisible to telescopes, yet its gravitational influence is manifest in the orbital speeds of stars around galaxies and in the motions of clusters of galaxies. Yet, despite decades of effort, no one knows what this \"dark matter\" really is. Many scientists think it's likely that the mystery will be solved with the discovery of new kinds of subatomic particles, types necessarily different from those composing atoms of the ordinary matter all around us. The search to detect and identify these particles is underway in experiments both around the globe and above it. Scientists working with data from NASA's Fermi Gamma-ray Space Telescope have looked for signals from some of these hypothetical particles by zeroing in on 10 small, faint galaxies that orbit our own. Although no signals have been detected, a novel analysis technique applied to two years of data from the observatory's Large Area Telescope (LAT) has essentially eliminated these particle candidates for the first time.WIMPs, or Weakly Interacting Massive Particles, represent a favored class of dark matter candidates. Some WIMPs may mutually annihilate when pairs of them interact, a process expected to produce gamma rays — the most energetic form of light — that the LAT is designed to detect. The team examined two years of LAT-detected gamma rays with energies in the range from 200 million to 100 billion electron volts (GeV) from 10 of the roughly two dozen dwarf galaxies known to orbit the Milky Way. Instead of analyzing the results for each galaxy separately, the scientists developed a statistical technique — they call it a \"joint likelihood analysis\" — that evaluates all of the galaxies at once without merging the data together. No gamma-ray signal consistent with the annihilations expected from four different types of commonly considered WIMP particles was found.For the first time, the results show that WIMP candidates within a specific range of masses and interaction rates cannot be dark matter. A paper detailing these results appeared in the Dec. 9, 2011, issue of Physical Review Letters. || ",
            "hits": 135
        },
        {
            "id": 10955,
            "url": "https://svs.gsfc.nasa.gov/10955/",
            "result_type": "Produced Video",
            "release_date": "2012-03-30T15:00:00-04:00",
            "title": "WIMPs—Weakly Interacting Massive Particles",
            "description": "Weakly Interacting Massive Particles, or WIMPs, represent one hypothesized class of particles to explain dark matter.They neither absorb nor emit light and don't interact strongly with other particles. But when they encounter each other, they annihilate and make gamma rays. || ",
            "hits": 699
        },
        {
            "id": 10663,
            "url": "https://svs.gsfc.nasa.gov/10663/",
            "result_type": "Produced Video",
            "release_date": "2010-11-01T00:00:00-04:00",
            "title": "Webb Science Simulations: Re-Ionization Era",
            "description": "The visualization shows galaxies, composed of gas, stars and dark matter, colliding and forming filaments in the large-scale universe providing a view of the Cosmic Web. The Advanced Visualization Laboratory (AVL) at the National Center for Supercomputing Applications (NCSA) collaborated with NASA and Drs. Renyue Cen and Jeremiah Ostriker to visualize a simulation of the nonlinear cosmological evolution of the universe.  Drs. Cen and Ostriker developed one of the largest cosmological hydrodynamic simulations and computed over 749 gigabytes of raw data at the NCSA in 2005. AVL used Amore software (http://avl.ncsa.illinois.edu/what-we-do/software) to interpolate and render approximately 322 gigabytes of a subset of the computed data. The simulation begins about 20 million years after the Big Bang - about 13.7 billion years ago - and extends until the present day.AVL(http://avl.ncsa.illinois.edu/) at NCSA (http://ncsa.illinois.edu/), University of Illinois (www.illinois.edu) || ",
            "hits": 329
        },
        {
            "id": 20148,
            "url": "https://svs.gsfc.nasa.gov/20148/",
            "result_type": "Animation",
            "release_date": "2008-07-16T00:00:00-04:00",
            "title": "Constellation X Spacecraft",
            "description": "A group of four spacecraft make up the Con-X observatory working in unison to peer into black holes. || ",
            "hits": 29
        }
    ]
}