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Energy from the Sun arrives through space as heat and light (and other things) as a form of electromagnetic radiation. There are two types of this, ionising and non-ionising.

Below about ultra violet wavelengths the energy is non-ionising, which means it does no harm except possibly heating things up too much.

At shorter wavelengths the energy is 'ionising', which means it could produce radiation sickness by altering atoms in the body. That is why too much sunshine occasionally causes skin cancer.

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11y ago

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