Editing Generation ship (section)

== Definition ==
According to Hein et al., a "generation ship" is a spacecraft on which a crew is living on-board for at least several decades, such that it comprises multiple generations.<ref name="hein-pak-putz-revisited" /> Several sub-categories of generation ships are distinguished: sprinter, slow boat, colony ship, world ship.<ref name="hein-pak-putz-revisited" />
The [[Enzmann starship]] is categorised as "slow boat" because of the ''[[Astronomy Magazine]]'' title "Slow Boat to Centauri" (1977).<ref>{{cite web|url= http://www.icarusinterstellar.org/wp-content/uploads/2012/05/BISEnzmann-Talk-2011kflong.pdf|title= The Enzmann Starship: History & Engineering Appraisal|first1=K.F. |last1=Long |first2=A. |last2=Crowl |first3=R. |last3=Obousy|access-date= 7 February 2013|url-status= dead|archive-url= https://web.archive.org/web/20130124211710/http://www.icarusinterstellar.org/wp-content/uploads/2012/05/BISEnzmann-Talk-2011kflong.pdf|archive-date= 24 January 2013}}</ref> Gregory Matloff's concept is called a "colony ship" and [[Alan Bond (engineer)|Alan Bond]] called his concept a "world ship".<ref name="hein-pak-putz-revisited" /> These definitions are essentially based on the velocity of the ship and population size.<ref name="hein-smith-marin-wsfar" />