KnowraSputnik 2Linked fromLinked fromThe 5 pages that link to Sputnik 2, each with the reason it gives.All 5Broader topic 3Related 2Sputnik 1Broader topic: It followed Sputnik 1 with a larger spacecraft and the first animal launched into Earth orbit.Soviet space programBroader topic: Its flight tested biological survival in orbit while extending the early satellite campaign.Vostok 1Related: Laika's flight tested life-support questions that later mattered for human missions.Sputnik crisisBroader topic: Its rapid follow-up intensified American perceptions that the Soviet lead was widening.Van Allen radiation beltRelated: Its radiation measurements contributed to the early evidence for trapped particles.