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ギズモード・ジャパン @gizmodojapan 【最新記事】 （太陽系を離れたはずの）パイオニア10号が、謎の力によって太陽の方向に引き戻されているようです http://bit.ly/c6GPbg #gizjp 2010-10-02 21:18:03
The Pioneer anomaly, or Pioneer effect, was the observed deviation from predicted accelerations of the Pioneer 10 and Pioneer 11 spacecraft after they passed about 20 astronomical units (3×109 km; 2×109 mi) on their trajectories out of the Solar System. The apparent anomaly was a matter of much interest for many years but has been subsequently explained by anisotropic radiation pressure caused by
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