Technique · The Cosmic Distance Ladder

Redshift & the Hubble–Lemaître Law

For distant galaxies, the expansion of the universe stretches their light to longer, redder wavelengths in proportion to their distance. Measure the redshift, apply the Hubble–Lemaître law, and you have the distance — the top rung of the ladder.

The Cosmic Distance LadderMeasures: Distance to distant galaxies

Cosmological Redshift
The Hubble–Lemaître Law
The Hubble Constant

Knowledge connections

Member of groupThe Cosmic Distance Ladder
Associated withCosmological Redshift
Associated withThe Hubble–Lemaître Law
Associated withThe Hubble Constant

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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.

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Redshift & the Hubble–Lemaître Law

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Redshift & the Hubble–Lemaître Law

Builds on

Knowledge connections

Sources