NASA is considering adding an extra day onto space shuttle Discovery's mission at the international space station.
It's because astronauts have found metal shavings inside a joint that is needed to turn a set of solar power panels. Space station managers want to make additional inspections of the joint while Discovery is docked.
A decision is expected later today.
Meantime, NASA has limited the joint's motion to prevent the debris from causing permanent damage. But that also limits the system's ability to generate power for the station.
Aside from that glitch, mission managers have cleared Discovery for re-entry November 6th, saying its thermal shielding is in good, solid condition.