Fifty-seven years ago, on July 20, 1969, the American spacecraft Apollo 11 landed on the moon, and two astronauts, including Captain Armstrong, became the first humans to set foot on the moon. Captain Armstrong's words, ``This is one small step for one man, but one giant leap for mankind,'' are perhaps the most well-known words after Gagarin of the former Soviet Union, who conducted the first manned spaceflight in 1961, said, ``The Earth was blue.''