Two years after the defeat of the Axis powers in World War II, the world superpowers of the United States, and the USSR began an almost 50-year political and military standoff. In a competition to prove both technological and intellectual superiority, the space race was born in 1955. With this, the two countries began a race to put the first man on the moon, which led to many technological breakthroughs in space exploration in its 20-year span. On October 4, 1957, Sputnik 1 became the first-ever artificial object to be launched into space. The satellite was a small aluminum sphere that was about 22 inches in diameter. Although it was only functional for three weeks in the Earth's orbit, it marked the first action in the space race. Less than a month after the success of Sputnik 1, the Soviet Union sent Sputnik 2 into space carrying Lakia, a dog. In 1958, the U.S. joined the space race by sending up the satellite Explorer 1. It wasn’t until 1960 that the first animals, two dogs named Belka and Strelka, safely landed back on Earth aboard Sputnik