The operation, postponed due to concerns about space debris, was aimed at replacing a broken antenna.

Two NASA astronauts have left the International Space Station (ISS) to make a spacewalk to replace a broken antenna system.

Earlier, this operation was postponed for two days due to concerns about space debris.

On Thursday morning, NASA astronauts Thomas Marshburn and Kayla Barron exited the ISS airlock to replace a faulty antenna that was used to transmit voice and data to ground control.

The spacewalk was originally scheduled for Tuesday, but it was postponed on Monday because NASA said it had received reports of space debris.

After the space agency determined that the debris did not pose a danger, the operation was postponed to Thursday.