▁nuclear ▁pul se ▁prop ulsion ▁are ▁likely ▁to ▁be ▁able ▁to ▁reach ▁the ▁nearest ▁star ▁significantly ▁faster . ▁Another ▁possibility ▁that ▁could ▁allow ▁for ▁human ▁inter stell ar ▁space fl ight ▁is ▁to ▁make ▁use ▁of ▁time ▁d ilation , ▁as ▁this ▁would ▁make ▁it ▁possible ▁for ▁passengers ▁in ▁a ▁fast - mov ing ▁vehicle ▁to ▁travel ▁further ▁into ▁the ▁future ▁while ▁ag ing ▁very ▁little , ▁in ▁that ▁their ▁great ▁speed ▁slow s ▁down ▁the ▁rate ▁of ▁passage ▁of ▁on - board ▁time . ▁ ▁However , ▁att aining ▁such ▁high ▁spe eds ▁would ▁still ▁require ▁the ▁use ▁of ▁some ▁new , ▁advanced ▁method ▁of ▁prop ulsion . ▁ ▁Inter gal actic ▁▁ ▁Inter gal actic ▁travel ▁involves ▁space fl ight ▁between ▁galaxies , ▁and ▁is ▁considered ▁much ▁more ▁techn olog ically ▁demand ing ▁than ▁even ▁inter stell ar ▁travel ▁and , ▁by ▁current ▁engineering ▁terms , ▁is ▁considered ▁science ▁fiction . ▁ ▁Space craft ▁▁ ▁Space craft ▁are ▁vehicles ▁capable ▁of ▁cont rolling ▁their ▁traject ory ▁through ▁space . ▁ ▁The ▁first ▁' true ▁space craft ' ▁is ▁sometimes ▁said ▁to ▁be ▁Apol lo ▁L un ar ▁Module , ▁since ▁this ▁was ▁the ▁only ▁cre wed ▁vehicle ▁to ▁have ▁been ▁designed ▁for , ▁and ▁operated ▁only ▁in ▁space ; ▁and ▁is ▁notable ▁for ▁its ▁non - a er od ynamic ▁shape . ▁ ▁Prop ulsion ▁▁ ▁Space craft ▁today ▁pre domin antly ▁use ▁rock ets ▁for ▁prop ulsion , ▁but ▁other ▁prop ulsion ▁techniques ▁such ▁as ▁ion ▁drives ▁are ▁becoming ▁more