Edwin Powell Hubble was a prominent American astronomer known for his groundbreaking contributions to the field of cosmology. Born in 1889, Hubble played a pivotal role in advancing our understanding of the universe. He is best known for his observations that led to the discovery of the expanding universe, fundamentally changing the way we view the cosmos. Hubble utilized the newly built Mt. Wilson Observatory's 100-inch telescope to study distant galaxies and their redshifts, revealing that galaxies were moving away from us, which implied that the universe is expanding. Hubble's most significant legacy remains the formulation of Hubble's Law, which establishes a relationship between the distance of galaxies and their recession velocity. This relationship provided strong evidence for the Big Bang theory and opened the door for modern cosmology. His findings demonstrated that the universe was much larger than previously thought and led to the idea that it has been expanding since its inception. In recognition of his contributions, the Hubble Space Telescope was named in his honor, allowing for even further advancements in astronomical research. Hubble's work has not only influenced generations of astronomers but has also shaped our understanding of our place in the cosmos. His discoveries continue to inspire exploration and curiosity about the universe around us. Edwin Powell Hubble was an influential American astronomer, born in 1889 and known for his significant contributions to cosmology. He played a crucial role in advancing our understanding of the universe and is best recognized for his discovery of the expanding universe. Utilizing the Mt. Wilson Observatory's 100-inch telescope, Hubble was able to observe distant galaxies and their redshifts, leading to the formulation of Hubble's Law. This law established a crucial relationship between galaxies' distances and their velocity of recession, supporting the Big Bang theory. In honor of his contributions, the Hubble Space Telescope was named after him, reinforcing his impact on astronomy. Hubble's discoveries not only transformed our understanding of the cosmos but also continue to inspire scientific exploration and inquiry.