NASA says its astronauts of Disovery will complete their second spacewalk, notwithstanding a passing by space debris 3 kms away.

A spacewalk by two astronauts of the Discovery is still on even though a large piece of space junk is headed their way.

Part of an old European rocket is expected to pass within two miles (three kilometers) of space shuttle Discovery and the international space station on Friday. NASA officials say that should be a safe distance and they do not expect the linked spacecraft to change course. But if the projections change, the astronauts would complete the spacewalk before steering out of the way.

The debris is believed to have a surface area of 200 square feet (18.5 square meters).

Astronauts Danny Olivas and Christer Fuglesang will install a new ammonia tank outside the space station. It will be the second spacewalk of the mission.

Keywords: DiscoveryNASASpacewalk

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