Discusses the objectives and technology of unmanned spacecraft.

With Space Probes: Exploring Beyond Earth, young readers can learn what a space probe is, what planets have been explored, what is a rover, and what future miss

"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

This is a completely updated and revised version of a monograph published in 2002 by the NASA History Office under the original title Deep Space Chronicle: A Ch