Because the mass ratio required for a given mission is exponential in the mission velocity divided by the effective exhaust velocity of the rocket propulsion system, high mission velocities rapidly become extremely expensive for chemical rockets, so that the mission velocity, along with the payload, is a key parameter in assessing the overall difficulty of a given mission. Missions that would at first appear to be infeasible due to high mission velocity can sometimes be done by means of various tricks, such as gravity assist encounters with planets along the way, aerobraking, staging to intermediate bases, etc. Some of these have been described in the large literature of astronautics, e.g. Arthur C Clarke's Interplanetary Flight, and many others.
Researchers Submit Patent Application, "Vehicle Dynamic Control Systems with Center of Gravity Compensation Based on Cargo Information", for Approval
Nov 08, 2012; By a News Reporter-Staff News Editor at Politics & Government Week -- From Washington, D.C., VerticalNews journalists report that...