Allan Sandage Summary

Allan Rex Sandage 1926- American astronomer who was a pioneer in radio astronomy and who, in 1961, discovered quasars (quasi-stellar radio sources). Located billions of light-years away, quasars are s... Read more

Astronomer Allan Rex Sandage (born 1926) took it as his life's work to find out how old and how large the universe is. His work led him to conclude the universe is 15 billion to 20 billion years old. ... Read more