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Answer:
Comets were found to emit X-rays in 1996. It was a surprising discovery as X-ray emission are usually associated with very high-temperature bodies. The X-rays are considered to be generated by the interaction between comets and the solar wind: when highly charged ions fly through a cometary atmosphere, they collide with cometary atoms and molecules, tearing off, one or more electrons from the comet. This tearing off leads to the emission of X-rays and far ultraviolet photons.
Category : Comets
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