Pe = Potential energy Ke = kinetic energy i want to clear up some confusion in me... firstly...it is true to say that potential energy transforms into kinetic energy as an object...correct? then the definition of an ORBIT is constantly falling around a planet, non-stop... therefore, Poetential energy is constantly being transformed into kinetic energy and an orbit is continuous and will never stop unless an external force acts upon it. i.e. the Pe will continue to transform into Ke for all eternity, which also implies there is infinite Potential energy...which contradicts the law of conservation of energy... i know Pe can be calculated by the height from which it is above the center of earth, but that is not the point... so is there anything wrong with waht i said? or have i proved physics contradictory?