Posted: Mar 24, 2017 7:21 pm
crank wrote:"Brightness" is a photons per some area thing, isn't it? You'd have the same brightness, but at longer wavelength.
Line-of-sight absorption affects received brightness too. There are models from other measures to help. Ooh - and gravitational lensing may affect some measurements and other stuff that I haven't thought about yet, and...
So it goes.