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Hubble Constant

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

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