WATCH: The flight of Gemini 4 launched today in 1965 for NASA’s first Extra Vehicular Activity (EVA) spacewalk by Ed White on a four-day orbital mission with commander Jim McDivitt.
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Astronauts perform third spacewalk to fix cosmic ray detector
After prepping their patient — a $2 billion cosmic ray detector — during two earlier spacewalks, two space station astronauts ventured back outside for a third outing Monday to carry out what amounted to transplant surgery, installing replacement coolant pumps in a bid to revive the costly instrument and extend its life.