Recent content by semiserious

Hi, Can anyone explain (physically) why the angular diameter distance starts to decrease after a certain redshift (around z = 1.5)? Thanks

Hi all, I have 2 questions related to the blackbody spectrum. 1 - If a blackbody emits (and absorbs) energy at all wavelengths equally, why does the spectrum look the way it does (i.e. why does it peak in intensity at a given wavelength?) 2 - The fact that the cosmic background radiation...