Canadian Journal of Pure & Applied Sciences

Abstract: To discuss of evaluations of propagation speeds of gravitational phenomena in continuous media is the main purpose of this review. This work touches the original work by Newton published in 1687, in which the gravitational phenomena propagate with an instant speed. In the second half of 1700s, Le Sage and Laplace have independently evaluated the propagation speeds of the gravitational phenomena to resolve the problem of the instant propagation. Each of them has actually obtained noninstant speeds for the phenomena but many orders faster than the speed of light in a vacuum. Several interesting independent evaluations were carried out in the last and this centuries by Kozyrev, Atsukovsky, Fedulaev, and the others. These evaluations have confirmed that the propagation speeds are almost instant but not instant. In the 1950s, Kozyrev has even created his own nonoptic experimental tools to observe true positions of stars distant from the earth on 10 to 1000 light years. Today some research teams have successfully realized new communication based on the fast speed gravitational phenomena that can be used for the instant interplanetary communication. Also, some researchers have recently proposed fast interplanetary spaceships with gravitational phenomena engines. It is expected that this review can be useful for both researchers-engineers working in the gravitational phenomena research arena and students for educational purposes. This review can also contribute to the successful creation of perfect infrastructure for the instant interplanetary (interstellar and even intergalactic) communication because some developing research directions were discussed