For ten points, name this NASA program best known for its 10th and 11th probes.
The third mission of this name sought to measure the strength of Van Allen Belts, while this series of spacecraft names an anomaly showing an unpredicted change of trajectory. Another mission of this name explored Saturn and the rings before changing heading out to of the Solar System, like its previous incarnation did, as it headed toward Aldeberan by passing through an asteroid belt. The 6th-9th of this operation features a weather network. For ten points, name this NASA program best known for its 10th and 11th probes.
The third mission of this name sought to measure the strength of Van Allen Belts, while this series of spacecraft names an anomaly showing an unpredicted change of trajectory.
{Pioneer} program