Space shuttle Discovery: launch (Image © REUTERS/Scott Audette)
NASA asked its Shuttle astronauts on Monday to take a closer look at the gears that control the international space station's solar wings to try to locate a problem in the mechanics of the system.
The "exploratory surgery" will almost certainly keep shuttle Discovery in orbit for an extra day. During a spacewalk already planned for Tuesday, astronaut Scott Parazynski will inspect a good rotary joint that turns the space station's left set of solar wings towards the sun.
NASA wants to see what a perfectly running unit looks like to compare it to the problematic one on the opposite side. On Sunday, spacewalker Daniel Tani found black dust that resembled metal shavings inside the motorised joint that controls the right set of solar wings.
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In pictures: the voyage of space shuttle Discovery

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Click to enlargeSpace shuttle Discovery crew: click to enlargeSpace shuttle Discovery on launch pad: click to enlargeDiscovery poised for lift-off: click to enlargeA message to mum: click to enlarge

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