Wilzax , 8 months ago (edited 8 months ago)

youtu.be/XBr4GkRnY04 this old video from Veritasium explains the concept of the hubble sphere and the particle horizon, both of which are further than 13.8.Billion lightyears away

youtu.be/eVoh27gJgME this newer video from PBS Spacetime goes into much further detail about how they’re calculated

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