this post was submitted on 05 Oct 2023
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As in, are there some parts of physics that aren't as clear-cut as they usually are? If so, what are they?

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[–] Wilzax@lemmy.world 3 points 1 year ago* (last edited 1 year ago)

https://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

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