Reality Check
Penultimate Amazing
A rather incoherent post, Bjarne, so you need to try writing it again in better, clearer English.Its not possible because even though,...
As written it sounds like the simple fact that telescopes detect light (the EM spectrum). Well duh
!The fact is we can compare todays and yesterdays EM spectrum. We do it all of the time, e.g. COBE, WMAP and Planck data. Astronomers look at the light from the Sun and compare it to light from labs analyzed decades or even centuries ago. That for example was how helium was discovered.
Yesterday is not gone. Every light-year a star is away from us is a year into the past.
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