Pioneer anomaly

English

Etymology

Named after NASA space probes Pioneer 10 and Pioneer 11.

Noun

Pioneer anomaly (countable and uncountable, plural Pioneer anomalies)

1. (aerospace) The observed deviation from predicted accelerations of the Pioneer 10 and Pioneer 11 spacecraft after they passed about 20 astronomical units on their trajectories out of the Solar System.

Further reading

• Pioneer anomaly on Wikipedia.Wikipedia