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1957年10月4日,苏联从拜科努尔发射场用“卫星”号运载火箭成功发射了世界第一颗人造地球卫星,从此揭开了人类航天活动的序幕,开创了宇宙航行的新纪元。这颗被称为“伴侣1号”的人造卫星重83.6千克,近似球形直径58厘米,由铝合金制成,以每秒8千米的平均速度在椭圆轨道上环绕地球运行,于1958年1月4日坠入大气层途中烧毁。下面是各国发行的纪念邮票。
On October 4, 1957, the Soviet Union successfully launched the world’s first man-made earth satellite from the Baikonur launch site using the “Satellites” launch vehicle. It has thus opened the prelude to human space activities and opened a new era in space navigation. The satellite, known as Companion 1, weighs 83.6 kilograms and has an approximate spherical diameter of 58 centimeters and is made of aluminum alloy and circumnavigates the Earth at elliptical orbits at an average speed of 8 kilometers per second On the 4th of fall into the atmosphere on the way to burn. The following is a commemorative stamp issued by various countries.