Biosatellite 2
a satellite designed to investigate the
influence of space flight on living organisms
Luna
a series of probes that were designed to study
the Moon
Lunar Orbiter Program
a series of probes launched for the purpose of
"scouting" potential manned landing
sites
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Pioneer 10
the first man-made object to travel through the
Asteroid Belt and to make direct observations of
Jupiter
Ranger Program
the first U.S. attempt to obtain close-up images
of the lunar surface
Surveyor Program
the first spacecraft to make a soft landing on
the Moon
Voyager Program
two spacecraft launched in 1977 on a mission to
explore the outer planets
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