This hub post presents seven essential facts about the Hubble Constant: what it measures, how astronomers determine it, current value estimates and the Hubble tension. Use this guide to get a concise overview and follow linked deep-dive posts on measurements, history, and the implications for the age and fate of the universe.
Explore the 10 most accurate ways to measure star distances in this comprehensive hub—covering parallax, astrometry, Cepheid variables, RR Lyrae, spectroscopic parallax, redshift, VLBI, eclipsing binaries and more. Each concise summary links to in-depth posts that explain how each technique works, its typical accuracy and range, required instruments, and real-world use cases.
