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Hubble's Law

Recession velocity of galaxies with distance.

Formula

v=H0dv = H_0 d

Variables

vVelocity
H_0Hubble constant
dDistance

Example

A galaxy 100 Mpc away recedes at v ≈ 70·100 = 7000 km/s.

Did You Know?

Hubble's law revealed the universe is expanding — distant galaxies flee faster the farther away they are.

cosmologyexpansionhubble