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Anderson, et al. (gr-qc/9808081) have recently reported the discovery of anapparent anomalous, weak, long-range acceleration in the Pioneer 10/11 andUlysses spacecraft. I believe that this result can be explained bynon-isotropic radiative cooling of the spacecraft electronics through passiveradiators on the spacecraft surface. These radiators are preferentially placedon the anti-solar side of the spacecraft to avoid heating by solar radiation.The power transmitted through these radiator panels can explain the observedacceleration within the observational errors.Comment: REVTEX v3.1, 3 pages with no figures submitted to Physical Review  Letter

Prosaic Explanation for the Anomalous Accelerations Seen in Distant Spacecraft