Explanations are provided that enable to understand how observations of planetary movements provide evidence for the different models of the solar system. (tes.com)
«If it's the size of Mars, that is a pretty big object, which would suggest it would be most likely scattered out there by planetary movements further in,» says Volk. (newscientist.com)
And, «In April 2008, it was announced that two simulations of long - term planetary movement, one at the Paris Observatory and the other at the University of California, Santa Cruz, indicate a 1 % chance that Mercury's orbit could be made unstable by Jupiter's gravitational pull sometime during the lifespan of the Sun. (americaspace.com)