"John Anderson and his JPL colleagues had for years puzzled over "residual errors" between the calculated and measured positions of the Pioneer spacecraft. Anderson first saw the effect in
1980, but until he had accumulated data over the next 15 years, he could easily dismiss it as systematic errors."
I have a page on the subject at my site.
http://www.geocities.com/solarstormmonitor/

• I suspect that dark matter may be the root of the problem. - yanniru - June 2, 2001 - 12:51 UTC
  • Then why other planets do not feel it? - alexander - June 7, 2001 - 00:01 UTC