The answer is the stars are incandescent sources, where peak radiation frequency is proportional to stellar temperature.
The color of starlight is dependent on incandescence while the color of light from the signs is based on fluorescence.
What is the color of starlight?
- The typical hue of starlight in the visible cosmos is a yellowish-white tone known as Cosmic Latte.
- In 1814, Joseph Fraunhofer pioneered stellar spectroscopy, or the investigation of star spectra.
- Shorter waves have larger energy and resonate at higher frequencies. The frequency of red light is roughly 430 terahertz, whereas the frequency of blue light is closer to 750 terahertz.
- Each red photon of light transmits around 1.8 electron volts (eV), whereas each blue photon transmits about 3.1 eV.
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