Why sun looks like burning fire?

The Sun appears like a burning fire due to its intense nuclear fusion reactions occurring in its core, which generate enormous amounts of energy and heat. This energy radiates outward, emitting light and heat that make the Sun glow brightly. The visible spectrum of this emitted light gives it a warm, fiery appearance, especially when viewed from Earth, where atmospheric effects can enhance its fiery look during sunrise and sunset. Additionally, the Sun's surface temperature of about 5,500 degrees Celsius contributes to its bright, flame-like appearance.