A Project Gemini EVA umbilical.
The accompanying sign reads
Umbilical Cable: Tether
Astronaut Ed White performed the first U.S. EVA (extravehicular activity),
lasting 20 minutes, from Gemini 4 in 1965.
He was secured to the spacecraft by a 25 ft gold plated umbilical cable which
also connected the suit to the on-board communications and life-support
systems. The hand-held self-manuevering
unit in his right hand helped him control his movements.
This artifact was previously
displayed in Space Hall.