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Glossary term: X-Ray Astronomy

Description: X-ray astronomy is a field of study dedicated to collecting and analyzing all the information that comes from the cosmos in very energetic electromagnetic radiation (more energetic than ultraviolet radiation but less energetic than gamma radiation). X-rays are between the frequencies of 30 petahertz to 10 exahertz, which corresponds to wavelengths between 10 picometers and 10 nanometers. As the atmosphere absorbs most X-rays, X-ray astronomy is typically done by space telescopes. X-rays from astronomical sources come from extremely hot regions. These include the disks around black holes or the hot corona of stars.

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The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".