Allan Sandage

Allan Sandage was a prominent American astronomer known for his significant contributions to our understanding of the cosmos, especially in stellar astrophysics and extragalactic astrophysics. He played a key role in refining the measurement of cosmic distances, which helped determine the size and expansion rate of the universe. Sandage was also instrumental in the study of quasars and galaxy formation, providing insights into the life cycles of stars and the properties of galaxies. His work greatly enhanced our knowledge of the universe's structure and evolution, influencing both observational techniques and theoretical models in astronomy.