Friedmann (Alexander Friedmann)

Alexander Friedmann was a Russian mathematician and physicist who, in the early 20th century, developed equations describing how the universe expands or contracts over time. His solutions to Einstein's General Relativity showed that the universe isn't static, but dynamic—possibly growing larger or smaller. Friedmann's work laid the foundation for the modern understanding of an expanding universe, supporting observations like cosmic redshift. His models are fundamental to cosmology, helping scientists understand the universe’s shape, age, and evolution based on current physical laws.