Here's why:
* Extreme Temperature: The core of the sun is incredibly hot, at around 27 million degrees Fahrenheit (15 million degrees Celsius). At these temperatures, atoms are stripped of their electrons, creating a plasma, which is a superheated, ionized gas.
* Light Emission: This plasma emits radiation across the entire electromagnetic spectrum, including visible light. We perceive different wavelengths of visible light as different colors, but the sun's core emits all wavelengths, resulting in a white-hot glow.
* No Visual Observation: We cannot directly observe the sun's core. Our understanding of its composition and temperature comes from scientific models and indirect observations.
Therefore, while we can say the core is "white-hot," it's more accurate to say it emits radiation across the entire electromagnetic spectrum.