Science: Longest Look

Edwin Powell Hubble of Mt. Wilson Observatory has at his disposal a 100-inch reflector, world's largest telescope, and with it he takes longer looks into space than any other man. Before the National Academy of Sciences last spring, Astronomer Hubble put the limit of the visible universe at 300,000,000 light-years from Earth (TIME, May 7).* Later he extended the limit to 400,000,000 lightyears. Last week he reported catching on a high-speed photographic plate the faint impression of a galaxy of stars 500,000,000 light-years away.

Dr. Hubble is renowned for his discovery that the spectrum...