1969 – A global audience watched on television as Apollo 11 Astronaut Neil Armstrong took his first step onto the moon. As he stepped onto the moon’s surface he proclaimed, “That’s one small step for man, one giant leap for mankind” – inadvertently omitting an “a” before “man” and slightly changing the meaning. Michael Collins did not walk on the Moon; instead, he orbited the lunar surface during that first Moon landing, keeping vigil over Neil Armstrong and Buzz Aldrin as they walked the surface below.

Source: on this day, wiki