Vesto Melvin Slipher

Vesto Melvin Slipher was an American astronomer known for his pioneering work in spectroscopy, the study of how light interacts with matter. In the early 20th century, Slipher used this technique to analyze the light from distant galaxies. He discovered that many of these galaxies were moving away from us, indicated by a redshift in their light spectrum. This finding provided strong evidence for the expansion of the universe. His research laid the groundwork for later developments in cosmology, profoundly influencing our understanding of the universe's origins and structure.