The guess is that the sun is a super gigantic network. Then from what I speculate. An atom machine type of a network has starting values that are important to its surroundings. They the starting values I guess are revealed by the emitted light.
So for a complex part of an invention. Its imperative to know the atom network starting values. That is. Its parameter starting configuration.
So light emission should be part of the toolkit. There should exist direct ways and indirect ways to measure things.