Assuming I'm on the same, erm, wavelength, one could extrapolate the passage of time as a function of cosmic radiation since any observation into deep space is

Assuming I'm on the same, erm, wavelength, one could extrapolate the passage of time as a function of cosmic radiation since any observation into deep space is also an observation of time (a planet one light-year away looks to us today as it did one year ago). I think it's a fascinating premise. We don't really know what time is, and if we never figure it out and how to control it, all of existence will vanish when entropy gets the last laugh. That is, if human conflicts don't do us in first...