What is the modern cosmological debate known as the Hubble Tension?
The discrepancy between modern measurements of the Hubble Constant ($H_0$)
The Hubble Tension refers to the current significant divergence found between the precise values calculated for the Hubble Constant ($H_0$) when derived using different modern measurement techniques. For instance, data from the Planck satellite suggests a value around $67.80 ext{ km/s/Mpc}$, whereas independent measurements from teams like SH0ES point towards a higher value, near $74.22 ext{ km/s/Mpc}$. While Hubble established the fundamental relationship, pinning down the exact constant remains challenging. This tension indicates that while the foundational law is sound, the discrepancy in $H_0$ values—which dictates the calculated age and expansion rate of the universe—may ultimately require the development of entirely new physics to resolve satisfactorily.
