First American astronaut walks in space

One hundred and 20 miles above the earth, Major Edward H. White II opens the hatch of the Gemini 4 and steps out of the capsule, becoming the first American astronaut to walk in space. Attached to the craft by a 25-foot tether and controlling his movements with a hand-held oxygen jet-propulsion gun, White remained outside the capsule for just over 20 minutes.