It will take another eight months to determine whether he got the other correct say scientists analysing data from Nasa's Gravity Probe B satellite.

Gravity Probe B uses four ultra-precise gyroscopes to measure two effects of Einstein's general relativity theory.

A scientist starts with a bulldozer, follows with a shovel, and then finally uses dental picks and toothbrushes to clear the dust away from the treasure. We are passing out the toothbrushes now William Bencze, Stanford University

One of these effects is called the geodetic effect, the other is called frame dragging. A common analogy is that of placing a heavy bowling ball on to a rubber sheet.

The bowling ball will sit in a dip, distorting the rubber sheet around itself in much the way a massive object such as the Earth distorts space and time around itself.

The data from Gravity Probe B's gyroscopes clearly confirm Einstein's geodetic effect to a precision of better than 1%.

The scientists from Stanford are still trying to extract its signature of frame-dragging from the data.

They plan to announce the final results of the experiment in December 2007, following eight more months of data analysis.

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