The Expansion of the Universe

Overview

Using Cepheid distances and galaxy redshifts, Edwin Hubble showed in 1929 that galaxies recede faster the farther away they are — the universe is expanding, as Lemaître had derived two years earlier.

Why it matters

The observational foundation of modern cosmology and the Big Bang.

Credit

Objects & facilities

Mount Wilson Observatory

Bearing on theory

Confirmed

The Big Bang

Knowledge connections

Sources & references

Facts on this topic will be cited from these primary and reference sources.

NASANational Aeronautics and Space Administration
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.
BritannicaEncyclopaedia Britannica
General reference for the history of astronomy, biographies, and cultural context.

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