What happened on September 15 1958?

Answer 1

On September 15, 1958, the United States launched the first satellite in its Vanguard program, named Vanguard 1. This satellite was significant for being one of the earliest artificial satellites to be placed in orbit and helped gather valuable data about the Earth's atmosphere and radiation belts. Vanguard 1 was notable for its long lifespan, remaining in orbit for nearly six decades before re-entering the Earth's atmosphere in 2008. The launch was part of the broader space race between the U.S. and the Soviet Union during the Cold War.