Harold Urey was a prominent American chemist who is best known for his discovery of deuterium, a stable isotope of hydrogen, in 1931. He received the Nobel Prize in Chemistry for his groundbreaking work on isotopes in 1934. In addition to his pioneering work on isotopes, Urey is also well known for his contributions to planetary science and the search for extraterrestrial life. Some common synonyms for Urey include: chemist, Nobel laureate, isotopes expert, planetary scientist, extraterrestrial researcher, deuterium discoverer, and scientific innovator. His work continues to inspire and influence scientists in fields ranging from chemistry and physics to astronomy and astrobiology.