In 1957, the important event was the launch of Sputnik 1, the first artificial satellite. This marked the beginning of the Space Age and initiated the U.S.-Soviet space race. Sputnik's launch had significant global political and scientific implications, prompting further advancements in space exploration. ;
In 1957, the launch of Sputnik 1 marked the first artificial satellite sent into orbit by the Soviet Union, initiating the Space Age. This event significantly impacted global politics, leading to the U.S.-Soviet space race and advancements in technology. Thus, the correct answer is A. first human to orbit Earth.
;