Editing Interstellar ark (section)

== Specific proposals and research projects ==
The [[Enzmann starship]] proposed in 1964 is a large fusion-powered spacecraft that could function as an interstellar ark, supporting a crew of 200 with extra space for expansion, on multi-year journeys at subluminal speeds to nearby star systems.<ref name="ridpath78">{{Cite book |url=https://books.google.com/books?id=REEIAAAAIAAJ&q=Enzmann+starship |first=Ian |last=Ridpath |title=Messages from the stars: communication and contact with extraterrestrial life |year=1978 |publisher=Harper & Row |isbn=9780060135898 |archiveurl=https://web.archive.org/web/20131231165546/http://books.google.com/books?id=REEIAAAAIAAJ&q=Enzmann+starship&dq=Enzmann+starship&hl=en&ei=d5LmTOfOGIP_8AbYpLWvDQ&sa=X&oi=book_result&ct=result&resnum=10&ved=0CEkQ6AEwCQ |archivedate=2013-12-31 |quote="As long ago as 1964, Robert D. Enzmann of the Raytheon Corporation proposed an interstellar ark driven by eight nuclear pulse rockets. The living quarters of the starship, habitable by 200 people but with room for growth ..."}}</ref>

In 1955 [[Project Orion (nuclear propulsion)|Project Orion]] considered nuclear propulsion for spacecraft, suitable for deep space voyages.

In 1973–1978 [[Project Daedalus]] was conducted by the [[British Interplanetary Society]] to study uncrewed interstellar spacecraft.