A paper I heard about last year about gravity.

[bm0p700f]

In the back of the economist there are articles about new research. One of them was about a paper published in science I think. It concerned deviations form what general relativity predicts for the velocity of space probes.

I said that the measured velocities of a probe or probes was out by a few mm/s or cm/s or was it m/s (I suppose using doppler shift probe velocities could be measured very accurately) from what general relativity predicts (I probably have the units wrong. These deviation the article commented where not random but followed a power. I forgot at the time to look this paper and now I can remember so little about where to find eg. it title.

Does anyone remember what this paper is? Where the researchers measuring what they think they where measuring or has it disappeared quietly into the archives never to be seen again?

Help me find it please I would love to read it.

 

[tiny-tim]

Welcome to PF!

Hi bm0p700f! Welcome to PF!

Look at http://en.wikipedia.org/wiki/Pioneer_anomaly, and Google "pioneer anomaly" generally.

 

[bm0p700f]

Thanks. So nothing conclusive as to the cause yet. How perplexing. The link in the wiki entry to the MOND was interesting though. I have always wondered how that was formulated. Now I know.

 

[tiny-tim]

MOND link

The link in the wiki entry to the MOND was interesting though.

oh yes … i hadn't noticed that link … http://en.wikipedia.org/wiki/Modified_Newtonian_dynamics