Hubble's Law

Andromeda galaxy

The expanding Universe

The American astronomer Edwin Hubble uncovered important evidence that the Universe is expanding.

He compared the measured relative velocities (red shifts) of faraway galaxies with his estimates of their distances from the Earth.

In 1929 he announced his discovery that the further away a galaxy is from another point in space, the faster it appears to recede as the Universe expands - Hubble's Law.

But there was more to be discovered about the expanding Universe - dark energy.

Image: Hubble measured the distances to galaxies such as Andromeda (NOAO/AURA/NSF/T.Rector & B.A.Wolpa)

Watch and listen to clips from past programmes TV clips [3]

Andromeda galaxy

Introduction

Hubble measures the Universe's expansion.

About Hubble's Law

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