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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