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This light can show variations in brightness, reveal structure in cosmic objects, and contain huge amounts of information in how its wavelengths are distributed across a spectrum. A fourth component is time. Space isn’t static, and recording data through a given duration, called Time Domain Astronomy, tracks how details of an object like brightness, spectrum, location and structure change. An object can vary, it can move, or it can do both. || Astronomy_Axis_ProRes_3840x2160_2997.00500_print.jpg (1024x576) [124.8 KB] || Astronomy_Axis_1080.mp4 (1920x1080) [40.3 MB] || Astronomy_Axis_1080.webm (1920x1080) [3.9 MB] || Astronomy_Axis_ProRes_3840x2160_2997.mov (3840x2160) [2.1 GB] || Astronomy_Axis_4k.mp4 (3840x2160) [60.2 MB] || ", "release_date": "2023-11-08T00:00:00-05:00", "update_date": "2023-11-16T10:47:05.665550-05:00", "main_image": { "id": 860705, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a014400/a014451/Three_Types_Time_Domain_Events_ProRes_3840x2160_2997.01077_print.jpg", "filename": "Three_Types_Time_Domain_Events_ProRes_3840x2160_2997.01077_print.jpg", "media_type": "Image", "alt_text": "There are three main classes of how an object can vary in time: periodic, quasiperiodic, and transient.\r\rPeriodic change means there is a regular, fixed pattern to the change. Sunrise and sunset or a blinking pulsar are examples.\r\rQuasiperiodic means that there is a pattern, and the change or event happens again and again, but not as regularly, like hurricanes or flashes from hot material around black holes.\r\rTransient events are less predictable and often happen only once. Earthquakes and supernovas are transients. These are the hardest to observe because they can be brief and start unexpectedly. 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