James Peebles is a Canadian astrophysicist known for his significant contributions to our understanding of the universe. Born on April 25, 1935, he has focused on the cosmic microwave background radiation, which provides insights into the early universe. His work has helped explain how galaxies form and evolve over time. In 2019, Peebles was awarded the Nobel Prize in Physics for his theoretical discoveries in physical cosmology. His research has laid the groundwork for modern cosmology, influencing how scientists study the universe's origins and structure. Peebles' work continues to inspire new generations of astrophysicists.