What is the Hubble Tension? The Hubble tension refers to the discrepancy between different measurements of the Hubble constant (H₀), which describes the rate of expansion of the universe. This tension arises because two primary methods for determining H₀ yield significantly different results: Local Measurements: Observations of nearby galaxies using standard candles like Cepheid variables and Type Ia supernovae provide a higher H₀ value, around 73–74 km/s/Mpc. Cosmic Microwave Background (CMB) Measurements: Observations of the Read more…