Originally Posted by lucybelle
I thought it was green actually! My brother once measured the wavelengths coming from the sun and he measured that it was green. I guess he could have been wrong?
Well green is certainly coming from the sun as almost all other wavelengths of visible light as well as non-visible electromagnetic waves.
There are parts of the electromagnetic spectrum that are missing, but they are mere slivers in the spectrum of light that our sun gives off. If you were able to take a prism that could perfectly diffract the suns rays with great resolution and spread it out probably over the length of an entire city block or so, you would actually see these slivers of color that are missing. We call it the sun's absorption spectra.
All stars have different absorption spectra which are kind of like bar codes that tell us what types of elements the star is fusing inside.
I suspect that the color classifications we give to stars is purely based on the relative colors that they appear to us from inside our own atmosphere. Red giants may appear to us redder than the sun because they don't produce as much high energy photons in the blue to ultraviolet range as do younger suns. I don't know for sure, but it's interesting to look into! =3 Our atmosphere is able to block the small amount that is coming it to make it look red, but in space it would still look white.