303 | AMA | February 2025

9992.762 - 10011.492 Sean Carroll

Ryan Hibbs says, the light we see from stars represents the object as it was in the past due to the speed of light and the further away the object is, the faster it's moving away from us. How do we know from just this data that expansion is accelerating and not that expansion just used to be faster in the past than it is in the present? You know, I mean, cosmologists aren't dummies, okay?