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Nature 431, 494-495 (30 September 2004) | doi:10.1038/431494b; Published online 29 September 2004
Support sought to investigate sluggish Pioneers
Jim Giles
Physicists are looking at ways to study a tiny but mysterious force acting on a pair of spacecraft at the edge of the Solar System.One research team is seeking support to investigate flight data from the early stages of the Pioneer 10 and 11 missions, in a bid to understand why the craft are now travelling slightly more slowly than mission planners envisaged.
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