High Quality Content by WIKIPEDIA articles! X-ray astronomy is an observational branch of astronomy which deals with the study of X-ray emission or apparent emission from celestial objects. While X-ray emission is expected from sources which contain extremely hot gas or plasma that is millions of kelvins in temperature, X-rays have also been detected from discrete sources on or near other celestial objects that themselves do not appear to emit X-rays. In addition, celestial objects have been detected which reflect or fluoresce X-rays due to nearby X-ray emitting sources. X-rays can be generated by a variety of processes and these can in turn be modeled to understand the detection of X-rays from unexpected sources.

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