Hubble’s Law: Proof the Universe Is Expanding

Hubble’s Law shows that galaxies are moving away from us, revealing an expanding universe.
Edwin Hubble discovered in 1929 that galaxy recessional velocity increases with distance.
The relationship is expressed as 𝑣=H₀×𝑑, where H₀ is the Hubble constant.
Redshift in light from galaxies provides the key evidence for this cosmic expansion.
Hubble’s Law overturned the idea of a static universe and reshaped modern cosmology.
The law provides a method to estimate the age and size of the universe.
The exact value of the Hubble constant is still debated, creating a “cosmic tension.”
Hubble’s discovery laid the foundation for the Big Bang Theory.
Observations with modern telescopes like Hubble and Webb refine this measurement today.