Edwin Hubble discovered that galaxies recede at speeds proportional to their distance. This implies the universe is expanding from an initial singularity. Hubble’s Law provided the first observational evidence of the Big Bang in 1929. It transformed cosmology from speculation to measurable science. Modern instruments confirm this expansion rate, refining the age of the universe. It’s a simple yet profound insight into cosmic history.
It matters because Hubble’s Law provides empirical proof of cosmic expansion.
It also helps estimate the universe’s age and future evolution.
Galaxies are moving away from us, tracing back to a Big Bang origin.
Space Telescope Science Institute [stsci.edu]