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The Size and Age of the Universe
This chapter explores the measurement of the universe, its expansion, and the unresolved scientific tension regarding its age and size. It delves into the methods used to determine the age of the universe, such as supernovae and cosmic microwave background observations, and explains the concept of the horizon in the universe and how it constantly moves. The chapter concludes with a discussion on the speed of light and its relationship to the age and size of the universe.