#6: Gemini 4: America’s First Spacewalk (1965)
Just months after Alexei Leonov’s journey, American astronaut Ed White followed with a U.S. spacewalk, using a hand-held oxygen jet to float outside the Gemini 4 capsule over the Pacific Ocean. His 23-minute spacewalk covered an orbit from Hawaii to the Gulf of Mexico, but after just 3 minutes the jet ran out of fuel, forcing him to maneuver by twisting and tugging on his tether.
