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Space Sciences
Cosmology
1929
Intermediate

Hubble's Law

v=H0dv = H_0 d

Galaxies recede from us at speed proportional to distance—the universe is expanding.

By Edwin Hubble

Space Sciences
Hubble's Law
1929 · Edwin Hubble
Human Reviewed
84%

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Story PortalWho discovered this?Discover how Edwin Hubble and others shaped this equation.Visual PortalWhat does it look like?See the equation come alive in the Visual Studio.Machine PortalWhere is it used?Explore machines powered by this equation — distance ladder.Math PortalWhat does it derive from?Trace the mathematical lineage from friedmann equation.Future PortalWhere is it going?Precision cosmology with JWST
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Why it matters: Transformed cosmology from philosophy to measurable science.

Discoverers: Edwin Hubble (1929)

What does it mean?

Galaxies recede from us at speed proportional to distance—the universe is expanding.

Why should I care?

Transformed cosmology from philosophy to measurable science.

Equation Compass

North — Prerequisites

West — History

East — Applications

South — Derivations

Variables & Units

SymbolNameUnitMeaning
vvRecession velocity—km/s
H0H₀Hubble constant—~70 km/s/Mpc
ddDistance—Megaparsecs

Worked Example

Galaxy at 100 Mpc recedes at ~7000 km/s.

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Sources & further reading

Search WikipediaSearch Wolfram MathWorldOpen in Wolfram|AlphaWatch explainers on YouTube

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Equation Universe

Hubble's Law

v=H0dv = H_0 d

Real-world impact

Expanding universe

Galaxy redshifts map the cosmic web we observe with modern telescopes.

Photo: Unsplash — Milky Way

Galaxies recede from us at speed proportional to distance—the universe is expanding.

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