Caution as US pair leave International Space Station airlock after Russian anti-satellite missile test
Two US astronauts were set on Tuesday to venture out of the International Space Station (ISS) for a spacewalk to replace a failed antenna, facing what Nasa officials say is a slightly elevated risk from the debris of a Russian anti-satellite missile test.
Nasa TV planned to provide live coverage of the six-and-a-half-hour spacewalk, scheduled to begin at 7.10 ET (12.10 GMT) as astronauts Thomas Marshburn and Kayla Brown exit an airlock.
