Black body curves and Wien's law: changing the temperature redraws the emission curve of a glowing object against wavelength, next to the Sun's curve, showing the peak moving to shorter wavelengths and the area under the curve growing as the object gets hotter.
Heat a star and it gives off more red light, not less. Its peak just slides to blue
Every warm object glows across a whole spread of wavelengths, and the shape of that spread is set by its temperature alone. Hotter objects emit more at every wavelength, peak at a shorter wavelength and pour out far more energy in total. Raise the temperature and watch the curve grow past the Sun's.
Black body curve
T = 5800 K
Blue is your object. Amber is the Sun (about 5800 K) for comparison.
5800 K · peak 500 nm · visible
Temperature of the object5800 K
1000 K5500 K10 000 K
Peak wavelength
500 nm
in the visible
Total power vs Sun
×1.00
same area as the Sun
Know This
Heat an object and it emits more at every wavelength, its peak wavelength shrinks so that λmaxT stays constant, and its total energy soars.