1957年10月4日,苏联成功地发射了人类历史上第一颗人造地球卫星“卫星—1号”。图1为我国1958年10月发行的苏联第一颗人造卫星邮票。当年的11月3日,苏联又成功地发射了第二颗人造地球卫星“卫星—2号”。发射第二颗人造地球卫星实际上是为以后载人航天做实验。值得一提的是,“卫星—2号”与“卫星—1号”不同,“卫星—1号”没有搭载任何动物,而“卫星—2号”携带了一只雌性小狗,名叫 On October 4, 1957, the Soviet Union successfully launched the first man-made earth satellite “Satellite-1” in human history. Figure 1 shows the first satellite of the Soviet Union issued in October 1958 in China. On November 3 of that year, the Soviet Union successfully launched the second man-made earth satellite, “Satellite-2.” The launching of the second artificial Earth satellite is actually an experiment for the future manned space mission. It is worth mentioning that “satellite-2” is different from “satellite-1”, “satellite-1” does not carry any animal, and “satellite-2” carries a Only female puppy, named