Scientists are hoping to explain what they call the Pioneer Anomaly by digitizing and analyzing the 10 gigs of data stored on magnetic tape drives. The MSNBC space article on the subject is very vague about what the Pioneer Anomaly actually is. Apparently something at the edge of our solar system is 'pushing back' the Pioneer 10 and 11 probes. The probes were launched in 1972 and 1973 respectively. Apparently the probes are closer to the sun than people involved in the project think the probes should be. About 240,000 miles closer to the sun.