The Atlas-Able Pioneers

The Pioneer probe with its cross-like
thermal louvers

The Atlas Able Pioneer probes
were probably the first to have
a hydrazine propulsion system,
seen here during pre-launch
preparations at Cape Canaveral

Atlas-Able rocket with Atlas 20D as 
booster stands ready at launch
complex 14 at Cape Canaveral

Pioneer P-3 probe is 
launched by an 
Atlas-Able from 
Cape Canaveral 
at 0726 UT on 
26 November 1959

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