Astronomy: View from the Second Window

Three centuries have passed since Galileo peered through his primitive telescope and first saw the moons of Jupiter and the golden crescent of Venus. Telescopes have been vastly improved since then, but men still study the stars through the same window opening on the universe. Their best lenses and most perfect mirrors work with visible light, and what cannot be brought into focus seemed forever beyond man's reach.

Suddenly the view has changed. The burgeoning science of radio astronomy has created a second window in the sky. And astronomers anxious to examine...