「Eight more missions with similar satellites carried out experiments on various animals to test life-support systems and reentry procedures and to furnish data on space temperatures, pressures, particles, radiation, and magnetic fields.」
以后又发射了八枚类似的卫星,用各种动物进行试验,以检测生命维持系统,也试验了重返大气层的程序,并提供有关太空温度、压力、粒子、辐射和磁场等资料。