Q:  What is the peak wavelength for a star like the Sun?

            The Sun has temperature approximately T = 5800 K,
            so its peak wavelength is about

                        5000 Angstroms = yellow-green visible light

            Surprise, surprise.


    Q:  What is the peak wavelength for a live human being?

            Live humans have a body temperature about T = 37 C = 310 K,
            so their peak wavelength is around

                         9 microns

            This "heat radiation" can be detected by pit viper snakes,
            receptors in human skin (at close distances), and night-vision
            goggles.