Ever since 1957, we have launched spacecraft and artificial satellites into outer space.// Such space development has subsequently led to the problem of space debris, human-made objects in the earth’s orbit that no longer work.// At present there are approximately 23,000 pieces of debris larger than a softball and half a million pieces of marble-size debris orbiting Earth, which travel at speeds up to 17,500 miles an hour.// They can potentially damage all space vehicles, including the International Space Station and other manned spacecraft.// It is now necessary for us to clean up space debris.//