The Sun and Sunlight
The sun is the star at the center of our solar system that is the source of warmth and energy for our planet. The sun's energy production takes place through nuclear fusion. These reactions emit electromagnetic energy, which is what interests us. Part of the electromagnetic spectrum is light.
The light can be broken down into its various wavelengths (colors). Part of the magnetic spectrum that we can not see is UV or ultraviolet light. UV light from the sun can damage DNA which is the genetic material of our cells. Research has shown, for example, that melanoma is primarily caused by UV-damaged melanocytes in our skin. These cells then grow out of control and can spread to other parts of the body.
Find out what makes sunlight a risk factor in getting skin cancer.