Scientists are looking for barely perceptible fluctuations that would be caused in Cassini's speed relative to Earth if gravitational waves of certain wavelengths were traveling through the solar system. They expect analysis of the data to take months. Cassini will be used for two more periods of gravitational wave investigation before it reaches Saturn.

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Interesting experiment. I wonder if some manifestation of grav wave phenomenon could be involved in the recent confirmation of velocity anomalies in the Pioneer/Voyager probes? A longer harmonic of a fundamental grav wave frequency? I cannot think of one that fits the data...a slowdown apparently always vectored towards the Sun from different directions.

-p