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Another option might be to move a asteroid such as Ceres into an elliptical planet crossing orbit, and force it to crash into Venus at the appropriate place and angle. Of course, the risk is that if a large asteroid from beyond Earth is moved into a Venus crossing orbit, it would also be in an Earth crossing orbit.Could I gain enough energy by merely changing the eccentricity of one or more asteroid orbits?No doubt some of the physicists here will tell me that it is too much energy alter the eccentricity of orbit of a large asteroid or dwarf planet into a Venus crossing orbit. Or, that a tangential impact of Ceres would not be enough to make a 24 hour day.And, of course, we would have to be far more advanced than we are today to convince any government to allow one to move an potentially planet killing asteroid into an Earth crossing orbit, especially if it would be a multi-generational project.
Clifford, I am afraid that your very nice orbital diagrams are in error. The sun is at one focus of any elliptical orbit, not at the geometric centre.