With the advent of more efficient propulsion technology, space travel reaches a new level of attainability, the Uplands phenomenon being a product of direct access, for those wealthy enough, to the lower orbits.
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Later development by Harold R. Kaufman resulted in the Kaufman Duoplasmatron which has been used for applications as diverse as semiconductor manufacture, and spacecraft propulsion.
A resistojet is a method of spacecraft propulsion (electric propulsion) that provides thrust by heating a (typically non-reactive) fluid.
Technological breakthroughs are improvements made to equipment or medicines, such as a new fertility drug which greatly increases population growth, new engines for ships that make them more efficient, new mining or farming methods, etc.
Mini-Mag Orion (MMO), or Miniature Magnetic Orion, is a proposed type of spacecraft propulsion, based on the Project Orion nuclear propulsion system.
The technique is an evolution of William Duddell's "singing arc" of 1900, and an innovation related to ion thruster spacecraft propulsion.