== Eksterne henvisninger ==
{{Commonscat|Ion propulsion}}
*[http://ing.dk/100308 5. aug 2009, Ing.dk: En million grader varme ioner kan sende rumskib til Mars på 39 dage] Citat: "... 100 gange kraftigere end andre ionmotorers..."
*[http://www.sciencedaily.com/releases/2006/01/060112040320.htm 2006-01-12, Sciencedaily: Europeans And Australians Make Space Propulsion Breakthrough] Citat: "...The new engine is over ten times more fuel efficient than the one used on SMART-1..."
*[https://ing.dk/artikel/fremskridt-ion-motorer-51057 26.10.2003, Ing.dk: Fremskridt for ion-motorer] Ny motor fra firmaet Aerojet har tre gange bedre ydelse end nuværende motorer til [[rumraket|raketter]].
*[http://space-power.grc.nasa.gov/ppo/projects/next/index.html NASA's Evolutionary Xenon Thruster (NEXT)] {{Webarchive|url=https://web.archive.org/web/20031013165625/http://space-power.grc.nasa.gov/ppo/projects/next/index.html |date=13. oktober 2003 }}
*[http://www.sciencedaily.com/releases/2003/11/031121072826.htm 2003-11-21, Science Daily: NASA Successfully Tests Ion Engine]
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