 "Space Center in Florida Ingus Kruklitis / Shutterstock.com")
Two NASA astronauts were set to embark on a spacewalk on Thursday to replace a faulty antenna on the International Space Station (ISS), after a 48-hour delay prompted by an orbital debris alert later deemed to be of no concern.
NASA TV planned live coverage of the 6-1/2-hour spacewalk, scheduled to begin at 7:10 a.m. Eastern time (1210 GMT) as astronauts Thomas Marshburn and Kayla Barron exit an airlock of the orbiting research lab some 250 miles (402 km) above Earth.
The outing is the fifth spacewalk for Marshburn, 61, a medical doctor and former flight surgeon with two previous
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