Main Question or Discussion Point
I am hoping that someone with broad knowledge of the physics literature can tell me when in the past tests were done on light coming from galaxies billions of light years away, tests that over time counted a decreasing number of photons from a single galaxy, or an increase in the wavelength of light from a single galaxy. It seems that an expanding universe would exhibit one or both of these characteristics, and I just assume these tests must have been done long ago. I am having no luck finding anything with the databases available to me and I was hoping someone could let me know where to look. Thanks.