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12854_Black_Hole_Corona_small.mp4 (1920x1080) [135.2 MB] || 12854_Black_Hole_Corona_ProRes_1920x1080.webm (1920x1080) [26.7 MB] || 12854_Black_Hole_Corona_SRT_Captions.en_US.srt [4.5 KB] || 12854_Black_Hole_Corona_SRT_Captions.en_US.vtt [4.5 KB] || ", "release_date": "2019-01-30T12:30:00-05:00", "update_date": "2023-05-03T13:46:09.289234-04:00", "main_image": { "id": 397684, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a012800/a012854/Black_Hole_Corona_Still.jpg", "filename": "Black_Hole_Corona_Still.jpg", "media_type": "Image", "alt_text": "Watch how X-ray echoes, mapped by NASA’s Neutron star Interior Composition Explorer (NICER) revealed changes to the corona of black hole MAXI J1820+070.\rCredit: NASA’s Goddard Space Flight Center\rMusic: \"Superluminal\" from Killer TracksComplete transcript available.", "width": 1920, "height": 1080, "pixels": 2073600 } }, { "id": 11482, "url": "https://svs.gsfc.nasa.gov/11482/", "page_type": "Produced Video", "title": "The Cloudy Cores of Active Galaxies", "description": "At the hearts of most big galaxies, including our own Milky Way, there lurks a supermassive black hole weighing millions to billions of times the sun's mass. As gas falls toward a supermassive black hole, it gathers into a so-called accretion disk and becomes compressed and heated, ultimately emitting X-rays. The centers of some galaxies produce unusually powerful emission that exceeds the sun's energy output by billions of times. These are active galactic nuclei, or AGN.Using data from NASA's Rossi X-ray Timing Explorer (RXTE) satellite, an international team has uncovered a dozen instances where X-ray signals from active galaxies dimmed as a result of a cloud of gas moving across our line of sight. The new study triples the number of cloud events previously identified in the 16-year archive.The study is the first statistical survey of the environments around supermassive black holes and is the longest-running AGN-monitoring study yet performed in X-rays. Scientists determined various properties of the occulting clouds, which vary in size and shape but average 4 billion miles (6.5 billion km) across – greater than Pluto's distance from the sun — and twice the mass of Earth. They orbit a few light-weeks to a few light-years from the black hole. || ", "release_date": "2014-02-19T11:00:00-05:00", "update_date": "2023-05-03T13:51:11.411556-04:00", "main_image": { "id": 458303, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a011400/a011482/agn_2013_mirko2000.jpg", "filename": "agn_2013_mirko2000.jpg", "media_type": "Image", "alt_text": "This animation shows an artist's rendition of the cloudy structure revealed by a study of data from NASA's Rossi X-Ray Timing Explorer satellite.Credit: Wolfgang Steffen, UNAM", "width": 1280, "height": 720, "pixels": 921600 } } ], "sources": [], "products": [], "newer_versions": [], "older_versions": [], "alternate_versions": [] }