10 Points for Astronomy?

It isn't, really. The color yellow is a purely human interpretation of a collection of radiation that hits the retinae of our eyes and gets processed by our visual cortex.

Animals seem to have some analogous way of discriminating light by some kind of 'coloration' sense, but we have no way to know if their brains actually 'see' the same thing we do when they look at 'yellow' light. Color detection is caused by photosensitive cells called 'cones', and some animals have none of these and would see the Sun as, presumably some shade of grey since there retinae have the black-white sensitive 'rods' instead, and which have a greater light sensitivity.
 
Sun is made up of gases mainly like hydrogen, helium and small amount of other elements like sulphur, magnesium, carbon, neon, iron, oxygen, nickel, chromium and calcium. Temperature on the surface of sun is approximately 5780K giving the sun white color but it often appears yellow to us when we look at the sun from the earth because of the atmospheric scattering of light.

The color yellow that we see is also a purely human interpretation of a collection of radiation that hits the retinae of our eyes and gets processed by our visual cortex.
 
Temperature of its surface at 5600*K makes it a yellowish-white dwarf star. After a lot of its blue light is scattered by our atmosphere, more yellow and red is left for us to see.
 
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