On October 4,1957,satellite 1 was launched from the Baikonur space launch site of the Soviet Union and entered the orbit around the earth,becoming the first man-made object to enter space. 1961:dongfang-1-the first time humans entered space

The earth is the home on which human beings live.In ancient times,human beings believed that the earth was the center of the universe.Many tribes fought to the death for land and resources,even in modern times

< 1 > 跳转到