[Southack]

"But again, it is impossible to measure, therefore we will not know until the technolgy is available."

Really? You mean we can't measure something that travels so fast as Gravity? That we can't see the impact of a Gravitational disturbance on our tides or our instruments? That we can't observe the plane in which each planet orbits?

[Aric2000]

Sure, but without a DIFFERENCE, ANY measurement of it would be inaccurate and impossible. You NEED differences in order to get a measurement, the planets are at a set distance, the moon is at a set distance.

So you could use them as a sort of calibration, but you need something that is moving away from or towards us, in order to get a measurement, and like I said, the technology is NOT available, and the only thing really BIG enough to get that measurement, would be from a star, a comet would be too small, even a wandering planet would be too small to get an accurate measurement from, because of course you need more then one instance to get a proper calculation.