Summary:
- This article discusses the concept of the cosmological constant, which was introduced by Albert Einstein in his theory of general relativity.
- Einstein initially included the cosmological constant in his equations to account for a static, unchanging universe, but later retracted it, calling it the "biggest blunder" of his life.
- The article explains how the discovery of the expanding universe by astronomer Edwin Hubble led to the rejection of the cosmological constant, and how it has since been reintroduced in modern physics to explain the observed acceleration of the universe's expansion.