Often cited as a ‘pioneer of the distant stars’, astronomer Edwin Hubble was one of the most important observational cosmologists of the 20th century. His meticulous study and research led to the discovery of a universe beyond Milky Way galaxy. He was also instrumental in creating a classification system for galaxies, known as Hubble’s sequence, which has been used for several decades. Though educated in law, Hubble had an interest in astronomy since a child. However, adhering to his father’s request, he did not take up its study until the latter’s death. Hubble’s career in astronomy flourished exceptionally. He played a pivotal role in deciphering the vast and complex nature of the universe. Through observation andresearch, he proved the existence of galaxies other than our own Milky Way. He also conducted the revolutionary work of finding a constant relationship between galaxies' redshift and distance, which helped to eventually prove that the universe is expanding. Additionally, he created a classification system for galaxies that has been used by other researchers for decades: the Hubble sequence.He was also instrumental in making the Nobel Prize Committee include astronomy in the field of physics, thus helping future astronomers gain recognition for their work in the field of astrophysics. Sadly, had Hubble not died suddenly in 1953, hemight have become eligible for that year's Nobel Prize in Physics.