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Hubble Constant

Hubble Tension Universe Expansion Cosmic Expansion Galactic Measurements Cosmic Distance Ladder Research Methods Supernova Measurements Galaxy Clusters Cosmic Microwave Background Measurement DESI Map Local Measurements Dark Energy Spectroscopic Instrument Local Void Theory Measurement Techniques Distance Measurement Methods Gravitational Lensing Expansion Rate Gravitational Waves Galaxy Dynamics Expansion of the Universe Expansion History Roman Space Telescope

Most Precise Local Hubble Measurement Sets H0 at 73.5 km/s/Mpc

Robust agreement across many distance tracers points away from a single local error.

Global Collaboration Pins Local Hubble Constant at 73.50 ± 0.81 km/s/Mpc With 1% Precision

New ‘Stochastic Siren’ Uses Gravitational-Wave Hum to Measure the Hubble Constant

Gravitational-Lens Time Delays Deliver New Hubble Constant, Deepening the Tension

New BAO Analysis Strengthens Local Void Solution to Hubble Tension