Main Question or Discussion Point
I just had the thought that atoms emit light at quantized levels but that would seem to imply that only certain energy levels could possibly exist instead of a complete spectrum. But, if light is traveling down or away from a gravitational field the frequency gets shifted. Would this make it such that there can be a continuous spectrum of light but only quantized values in any gives location in the field? Could you use the spectrum of say hydrogen in the middle of nowhere and look for shifts in the emission spectrum to detect something like dark matter?