Photosphere
In space and astronautical engineering, the photosphere is the visible surface of the sun that emits light and heat. It is the layer of the sun's atmosphere that we see from Earth. The photosphere has a temperature of around 5,500 degrees Celsius and is composed of plasma, which is a gas made up of positively charged ions and negatively charged electrons. The plasma emits light in a continuous spectrum, which appears as a bright yellow-white color to the human eye. The photosphere is also the source of the solar wind, a stream of charged particles that flows out from the sun and affects the Earth's magnetic field.
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