Answer:
The launch of the sputnik was a milestone in the history of science, and also, the history of mankind.
Step-by-step explanation:
It represented the first time that humanity sent a human invation to space. This achievement resulted from the large investment that the Soviet Union made in space technology during the 1950s and 60s.
The effect of the Sputnik was to prompt even more scientific research and space exploration. In the following years, the Soviet Union would send the first man to space: Yuri Gagarin, and the United States would get a man on the moon: Neil Armstrong.