The discussion centers on the concept of "tired light" versus the expanding universe theory, referencing Lyndon Ashmore's work and a peer-reviewed paper by C.S. Chen. Participants express skepticism about the validity of the tired light theory, noting contradictions in Ashmore's claims regarding blue and red shifts. Some users have read Ashmore's book and find it interesting, while others dismiss the tired light concept as outdated and incorrect. The conversation highlights the differences between observed Doppler shifts and the predictions made by the tired light theory. Overall, the thread reveals a divide in opinions on the credibility of tired light as an explanation for cosmic redshift phenomena.
