<Dl> <Dt> Aberration </Dt> </Dl> <P> As shown by Laplace, another possible Le Sage effect is orbital aberration due to finite speed of gravity . Unless the Le Sage particles are moving at speeds much greater than the speed of light, as Le Sage and Kelvin supposed, there is a time delay in the interactions between bodies (the transit time). In the case of orbital motion this results in each body reacting to a retarded position of the other, which creates a leading force component . Contrary to the drag effect, this component will act to accelerate both objects away from each other . In order to maintain stable orbits, the effect of gravity must either propagate much faster than the speed of light or must not be a purely central force . This has been suggested by many as a conclusive disproof of any Le Sage type of theory . In contrast, general relativity is consistent with the lack of appreciable aberration identified by Laplace, because even though gravity propagates at the speed of light in general relativity, the expected aberration is almost exactly cancelled by velocity - dependent terms in the interaction . </P> <P> In many particle models, such as Kelvin's, the range of gravity is limited due to the nature of particle interactions amongst themselves . The range is effectively determined by the rate that the proposed internal modes of the particles can eliminate the momentum defects (shadows) that are created by passing through matter . Such predictions as to the effective range of gravity will vary and are dependent upon the specific aspects and assumptions as to the modes of interactions that are available during particle interactions . However, for this class of models the observed large - scale structure of the cosmos constrains such dispersion to those that will allow for the aggregation of such immense gravitational structures . </P> <Dl> <Dt> Absorption </Dt> </Dl>

Who developed the theory about the effect of gravity