EntityQ1968531· pop 12· linked from 89 articlesTau ZeroSign in to save1970 novel by Poul AndersonConnectionsSwedenCountryMilky WayEntityNASAConceptBig BangEntityScandinaviaEntityInternational Standard Book NumberEntityvelocityEntitytheory of relativityEntityspeed of light in vacuumEntityscience fictionEntitynebulaEntitydark matterEntityOCLC, Inc.Entitytime dilationEntityPoul AndersonEntityBig CrunchEntityOpen LibraryEntityLorentz factorEntityultimate fate of the universeEntityhard science fictionEntityCategories1970 American novels1970 science fiction novelsAmerican English-language novelsAmerican science fiction novelsDoubleday (publisher) booksFiction about nebulaeFiction about time dilationHard science fictionNovels about the end of the universeNovels about time travelNovels by Poul AndersonOpen Library ID different from Wikidata