Pioneer 4

NASA

65 Years Ago: Pioneer 4 Reaches for the Moon

On March 3, 1959, the United States launched Pioneer 4 with the goal of photographing the Moon during a close flyby. As part of the International Geophysical Year that ran from July 1, 1957, to Dec. 31, 1958, the United States planned to send five probes to study the Moon. The first three planned to orbit the Moon, while the…