The first artificial Earth satellite is famously known as Sputnik 1. Launched by the Soviet Union on October 4, 1957, Sputnik 1 ushered in the space age and initiated the exploration of outer space. Weighing approximately 83.6 kilograms, this spherical satellite transmitted radio signals back to Earth, which were detectable by amateur radio operators. The launch of Sputnik 1 marked a significant technological achievement and spurred the space race between the United States and the Soviet Union, leading to numerous advancements in science, technology, and our understanding of the universe.