What are some interesting facts about ultraviolet light?

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Ultraviolet or UV light does have some interesting properties. One is that it has both positive and negative effects on human health. On the plus side, exposure to UV helps humans generate vitamin D. On the negative, overexposure increases the risk of skin cancer.

 

The ozone layer blocks some UV light, which is useful for human health, but which distorts our image of the universe, as very hot stars generate more UV light. That means we see the heavens in a slightly distorted fashion.


Of course, one fun fact about ultraviolet light is that some forms of it (known as black lights) make some things glow that don't glow in normal light.

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