The Expanding Universe: Hubble’s Landmark Discovery

In the 1920s, Edwin Hubble studied distant galaxies through Mount Wilson’s telescope.
He discovered galaxies were moving away from us in all directions.
The farther a galaxy, the faster it recedes—a relationship now called Hubble’s Law.
This proved the universe is expanding, not static as once believed.
Hubble’s work built on earlier observations by Vesto Melvin Slipher.
The discovery confirmed predictions of Einstein’s General Relativity.
It overturned centuries of belief in an unchanging cosmos.
Hubble’s findings laid the foundation for the Big Bang theory.
The Hubble constant quantifies the universe’s rate of expansion.
Today, studying expansion helps scientists probe dark energy and cosmic fate.