Monday, astronauts Stephen Bowen and Robert "Shane" Kimbrough performed the final spacewalk of space shuttle Endeavour's fortnight mission, leaving NASA’s International Space Station (ISS) to wander the outer space for the fourth and last time.

The two spacewalkers will try to unjam a massive joint that is supposed to render the power-generating solar wings on the space station's right side to face the sun, since the jammed joint has resulted in limiting the amount of energy the wings produce by preventing them from rotating towards the sun.

Space station captain Mike Fincke revealed that fixing the joint would allow the number of residents on the ISS to expand from three to six and also research to be performed 220 miles above Earth.

Astronauts Bowen and Kimbrough will finish lubricating the joint, since the previous three missions couldn’t manage to do that, being also set to lubricate a similar one for the station's left solar wings. During the spacewalk that was performed last week, lead spacewalker Heide Stefanyshyn-Piper dropped a $100,000 tool kit, which left astronauts to work with only one pair of grease guns, so the lube job could not be finished.

In addition, they will install a video camera, a spacewalk handrail and a GPS antenna and take some pictures of the equipment, as well.

This final mission, which was previously scheduled to spread over a period of two weeks, will be added another day in order to give the astronauts enough time to repair the water recycling system that the shuttle delivered, which has a faulty urine processor.