John R. Percy

Radar Views of VenusTHE SOVIET UNION has two scientific spacecraft in orbit around Venus, and American planetary scientists are puz-zled. When Veneras 15 and 16 reached the planet last year (on October lOth and 14th, respect àvely), t here was widespread spéculation that each craft carried a...

Dissecting the Hub of Our GalaxyTHE MILKY WAY'S innermost région is a fascinating enigma to astrono-mers. "We are still puzzled by what's there," summed up Charles Townes of the University of California, Berkeley, during a meeting last July at NASA's Ames Research Center. "It is very hard to...