World 3 · Redshift and Hubble's Law · 12 min · PRO

Reading redshift in a spectrum

From a shifted line to a redshift, a speed and a distance

PRO · Cosmos: Big Bang to Now

World 3: Redshift and Hubble's Law is part of PRO

The first world of Cosmos: Big Bang to Now is free. PRO opens the other 25 lessons in 6 worlds — simulations, quizzes and all.

Stretched light: Doppler vs cosmological redshift
The Hubble-Lemaître law: v = H₀ d
The distance ladder: how do we know how far?
The Hubble tension: two numbers that disagree
A hot, glowing young universe: recombination

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