Since the first spacecraft launched in 1957, there have been many ground-breaking missions that have expanded our knowledge of the solar system. The 50 featured

"To commemorate the 50th anniversary of the first successful planetary mission, Mariner 2 sent to Venus in 1962, the NASA History Program Office, the Division o

Full color publication. This document has been produced and updated over a 21-year period. It is intended to be a handy reference document, basically one page p