I can’t get my head around how we measured the radiation from the Big Bang in order to discover how old the universe really is. How does that specific radiation differ from many other types of radiation? Newest findings suggest that the age of the universe has been mistaken not because of an error in calculations, but because of some kind of error in the understanding of the nature of cosmos itself. While I will probably not think up anything remotely usefull to anybody, I’d like to understand this part – please help a humble redditor.
In: Physics
The CMB is detected by its light just like other things we detect with telescopes, it’s just not visible light. When you look in-between stars and galaxies with an optical telescope space appears completely dark but if you have a sensitive enough radio telescope you can pick up a faint background noise, or glow, coming from all directions. That glow is the CMB.
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