New York (Reuters): A pair of astronauts will venture outside the International Space Station on Tuesday for an emergency spacewalk to replace a failed computer, one of two that control major US systems aboard the orbiting outpost, NASA said on Sunday.
The primary device failed on Saturday, leaving the $100 billion orbiting laboratory to depend on a backup system to route commands to its solar power system, radiators, cooling loops and other equipment.
The ISS, which is staffed by rotating crews of astronauts and cosmonauts, serves as a research laboratory for biology, life science, materials science and physics experiments, as well as astronomical observations and Earth remote sensing.
The station , owned and operated by 15 nations, flies about 250 miles (400 km) above Earth and orbits the planet about every 90 minutes. It has been continuously staffed since 2000.