Astronauts to complete their last spacewalk

The crew onboard the Discovery shuttle are to complete the fourth spacewalk of their mission. They're to repair on a jammed solar wing in what will be their final spacewalk.

The astronauts have been allowed to extend the length of their mission, originally planned for 12 days, in order to complete their main task.

The crew held a news conference at the International Space Station after completing most of the tasks, saying they had a 'good feeling' about their success.

Discovery is now due back on Earth on Friday.