The core of the sun is so hot and there is so much pressure, nuclear fusion takes place: hydrogen is changed to helium. Nuclear fusion creates heat and photons (light).

Why does the sun give off white light?

The Sun *emits* white light, which is actually a composite of all of the visible frequencies of light. (A prism shows you the visible frequencies of white light.) ... The natural frequencies that nitrogen and oxygen resonate with the sunlight at are in the ultraviolet part of the white light solar spectrum.

When the sun emits light it is called?

All of the energy from the Sun that reaches the Earth arrives as solar radiation, part of a large collection of energy called the electromagnetic radiation spectrum. Solar radiation includes visible light, ultraviolet light, infrared, radio waves, X-rays, and gamma rays.