Editing Hermann Oberth (section)

=== Ion propulsion for interplanetary spaceflight ===
The principle of ion propulsion was first presented in 1929 by the space pioneer Hermann Oberth in his work ''Ways to Spaceflight'',<ref name="Oberth_b"/> which is referred to as the "Bible of Space Technology",<ref name="Barth"/>{{rp|117}} in which he describes for the first time the physics, the function, the construction and the use for the interplanetary flight of an ion engine on pages 386 to 399.
Oberth also presented at the 12th Rocket and Space Conference of the Deutsche Raketen-Gesellschaft (DRG) (German Rocket Society) in September 1963 in Hamburg, FRG a new idea for the electric spaceship.<ref name="Oberth_g">{{Cite book |last=Oberth |first=Hermann |date=1963 |title=The electric spaceship |publisher=EBÖ-Druck und Verlag der DRG, Hannover, FRG, Bölkow-Library}}</ref> Quote: "My proposal concerns an electric spaceship that does not emit ions and electrons, but rather nebula droplets that are 1,000 to 100,000 times larger in size depending on the project and to form an ion or electron as a condensation nucleus."