NASA postpones spacewalk at space station due to space debris warning

Update for 6 p.m. ET: NASA has now rescheduled Tuesday's spacewalk for Thursday, Dec. 2. 

A scheduled spacewalk by two NASA astronauts outside of the International Space Station has been postponed after a debris warning for the orbiting outpost caused NASA to act on the side of caution.

In a brief statement released just after midnight (EST, 0500 GMT) on Tuesday (Nov. 30), NASA said that the "lack of opportunity to properly assess the risk it could pose to the astronauts" led to flight controllers deciding to delay the spacewalk, which had been scheduled to begin at 7:10 a.m. EST (1200 GMT).

"The space station schedule and operations are able to easily accommodate the delay of the spacewalk," the space agency wrote on its website.

NASA did not release details about the nature of the "debris notification," including the source of the threat. 

A recent Russian anti-satellite (ASAT) weapon test resulted in a new cloud of more than 150 trackable pieces of debris and forced the space station crew to take temporary cover in the immediate aftermath on Nov. 14, but whether that event and the spacewalk delay were related was not yet clear.

"We don't have any [times of close approach] or any conjunctions we're worried about right now in terms of crew actions for you guys, but of course we'll keep you posted,” Mission Control in Houston radioed the space station's crew, according to a report by CBS News.

"It's just real life, this is how things work out sometimes, and I'm really glad you fellows are looking out for our safety," said NASA astronaut Mark Vande Hei, an Expedition 66 flight engineer, according to CBS News.

Astronauts Tom Marshburn and Kayla Barron had been scheduled to replace a faulty antenna system with a spare mounted elsewhere on the space station’s backbone truss structure. The planned six and a half hour spacewalk would have restored use of one of the complex’s S-band Antenna Subassemblies (SASA), which is used to send and receive signals to and from Earth via NASA's Tracking and Data Relay Satellite System. 

The antenna being replaced had lost its ability to send signals down to Earth.

The space station has additional low-rate S-band systems, as well as a high-rate KU-band communications system that relays video. The degraded capabilities have had a limited impact on normal station operations, so can await a rescheduled spacewalk.

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