NASA baffled by unexplained force

Are we questioning our old theories? Would it be that, things are not quite, what it seems to be? I hope we can move on and do the same for other old scientific models we have.

Mysteriously, five spacecraft that flew past the Earth have each displayed unexpected anomalies in their motions. These newfound enigmas join the so-called “Pioneer anomaly” as hints that unexplained forces may appear to act on spacecraft. A decade ago, after rigorous analyses, anomalies were seen with the identical Pioneer 10 and 11 spacecraft as they hurtled out of the solar system.

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(Full Article: http://www.unexplained-mysteries.com)