Here's how it worked:
* Redshift: Hubble observed that the light from distant galaxies was shifted towards the red end of the spectrum. This is known as redshift, and it indicates that the galaxies are moving away from us.
* Distance and Redshift: Hubble noticed a direct relationship between the distance of a galaxy and its redshift. The farther away a galaxy was, the greater its redshift. This implied a consistent expansion of space.
* Hubble's Law: This relationship was formalized into Hubble's Law, which states that the recession velocity of a galaxy is directly proportional to its distance from us.
* Expansion of the Universe: The redshift observations, combined with Hubble's Law, provided compelling evidence that the universe is not static, but rather expanding. This was a major shift in our understanding of the cosmos, replacing the long-held view of a static universe.
Hubble's discovery has had profound implications for cosmology. It provided the foundation for understanding the age, size, and evolution of the universe. His observations also paved the way for the Big Bang theory, which describes the origin and evolution of our universe.
