12 Greatest Space Missions in United States History
Wednesday, 13 April 2011 09:22 Published in HistoryJanuary 31, 1958 marked the launch of Explorer I and the start of the Space Age for the United States. Since then, Americans have witnessed many shining achievements from their space program, as men walked on the Moon and unmanned space probes continue exploring the far reaches of our solar system.
Choosing the greatest NASA missions of all time is a tough task, but here are 12 U.S. space missions that blazed a trail or accomplished something unique. (All photos courtesy of NASA)
