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All stars give out some ultraviolet light (including our Sun, which is why we get sunburn). If the star is young and hot, it gives off quite a lot, and if old and dim, only a little. All stars give off a wide spectrum of radiation, much of it invisible to our eyes. To calculate a star's total radiation, we use what is called a bolometric measurement.

The atoms in gases can also give off ultraviolet if their electrons are sufficiently excited by cosmic radiation.

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