"...Nasa's Pioneer 10 and 11 probes, launched in 1972 and 1973 and
   currently streaking out towards the stars. For the past 30 years, 
   both have been experiencing a mysterious force of one ten-billionth
   of a G, which is pulling them back towards the Sun and slowing them
   down. "The Nasa astronomers are totally baffled," says Foot.
   "They've ruled out all mundane effects such as fuel leaks and heat
   leaks."

   John Anderson, an astronomer at Nasa's Jet Propulsion Laboratory in
   California, has worked on the Pioneer project since 1970. He says:
   "For the life of me, I can't think of what could be causing the 
   effect."

   Marcus Chown reports
   12 August 2002

http://news.independent.co.uk/world/science_medical/story.jsp?story=323682
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