At another science forum site someone asked about the speed of gravity. I posted a link to a news article about Kopeikin's experiment and published results: http://www.nrao.edu/pr/2003/gravity/ Some excerpts are: I’d thought this was all but accepted by scientists, until another member there posted this link to a paper rebutting Kopeikin's results: http://www.metaresearch.org/media and links/press/SOG-Kopeikin.asp Here are some relevant quotes from that paper: I have a few questions. Is there general agreement now that Kopeikin’s team failed to measure the speed of gravity? Is it generally agreed that the speed of gravitational force is virtually instantaneous? In the article above they cited the following thought experiment which seems to make sense: “A common thought experiment asks: ‘What would happen to the Earth's orbit if the Sun suddenly ceased to exist?’ The answer is now clear. The usual relationship ‘force is the gradient of the potential’ would instantly end. The Sun's potential field would then begin to dissipate, taking 8.3 minutes to dissipate out to the distance of the Earth's orbit; so effects such as light-bending and clock-slowing would persist for that long. But the Newtonian component of gravitational force, the force that keeps Earth in its orbit, would cease almost instantly, and Earth would fly off along a straight line like a weight on a spinning merry-go-round that broke free from its moorings.” Mainly I wanted to ask this. If the speed of gravity is virtually instantaneous, what are people’s thoughts about what gravity is doing to space that would cause that? For example, would it be improper to see mass as having a “constricting effect” on space? In that case, the constricting effect would simultaneously affect every place the force extends, and then disappear concurrently everywhere if, as in the example above, the Sun suddenly ceased to exists.