6.Generally, among the terrestrial planets the Earth and Venus characterized by the haviest mass, highest escapevelocity, tied up much more gases which are more complicated in components and higher in density.
7.When the escapevelocity at a certain distance from the center reaches the speed of light, an event horizon is formed within which matter must inevitably collapse onto a single point, forming a singularity.
10.Then a new attractive force function and a new repulsive force function are deduced, which the robot can adjust its velocity to escape from obstacles, and move to target quickly, or track target synchronously.
