A rocket launch system comprising: a set of electric power lines extending from earth for carrying electrical power from a remote electrical power system on ground, said set of electric power lines having a low end portion for being positioned at a low altitude and a high end portion for extending into higher altitudes; a set of rocket-transporting device lines extending from ground for transporting a rocket-transporting device between a low altitude and a high altitude, said rocket-transporting device lines having a low end portion for being positioned at a low altitude and a high end portion for extending into higher altitudes; lighter-than-air support balloons connected to said sets of power lines and said rocket-transporting device lines for holding said sets of power lines and said rocket transporting device lines upwards to a high altitude above the earth; CHARACTERIZED IN THAT: said rocket launch system further comprises: at least one rocket-transporting device for transporting a rocket between a low and a high altitude; secondary lines (184, 184A, 184B, 184C) operatively connected to said set of electric power lines and to said set of rocket-transporting device lines for extending to altitudes higher than both the higher altitude of said set of electric power lines and said set of rocket-transporting device lines; and operating structures (166, 182, 200, 196) operatively connected to said secondary lines for performing operations for said rocket launch system; and lighter-than-air tensioning balloons connected to said secondary lines for both imparting tension to said secondary lines and for supporting said secondary lines when said electric power lines and said rocket-transporting device lines are at a high altitude above the ground; wherein said rocket-transporting device derives electrical power from said set of electric power lines while riding and travelling upon said set of rocket-transporting device lines between a low altitude and a high altitude. a set of electric power lines extending from earth for carrying electrical power from a remote electrical power system on ground, said set of electric power lines having a low end portion for being positioned at a low altitude and a high end portion for extending into higher altitudes; a set of rocket-transporting device lines extending from ground for transporting a rocket-transporting device between a low altitude and a high altitude, said rocket-transporting device lines having a low end portion for being positioned at a low altitude and a high end portion for extending into higher altitudes; lighter-than-air support balloons connected to said sets of power lines and said rocket-transporting device lines for holding said sets of power lines and said rocket transporting device lines upwards to a high altitude above the earth; said rocket launch system further comprises: at least one rocket-transporting device for transporting a rocket between a low and a high altitude; secondary lines (184, 184A, 184B, 184C) operatively connected to said set of electric power lines and to said set of rocket-transporting device lines for extending to altitudes higher than both the higher altitude of said set of electric power lines and said set of rocket-transporting device lines; and at least one rocket-transporting device for transporting a rocket between a low and a high altitude; secondary lines (184, 184A, 184B, 184C) operatively connected to said set of electric power lines and to said set of rocket-transporting device lines for extending to altitudes higher than both the higher altitude of said set of electric power lines and said set of rocket-transporting device lines; and operating structures (166, 182, 200, 196) operatively connected to said secondary lines for performing operations for said rocket launch system; and lighter-than-air tensioning balloons connected to said secondary lines for both imparting tension to said secondary lines and for supporting said secondary lines when said electric power lines and said rocket-transporting device lines are at a high altitude above the ground; wherein said rocket-transporting device derives electrical power from said set of electric power lines while riding and travelling upon said set of rocket-transporting device lines between a low altitude and a high altitude.