Space shuttle Discovery’s three main engines have been installed ahead of the launch of the STS-133 mission later this year. Workers at Orbiter Processing Facility-3 at NASA’s Kennedy Space Center in Florida will spend the weekend securing the engines and testing the main propulsion system. The astronauts who will fly Discovery to the International Space Station have a day off from training.
Discovery’s launch is now targeted for Nov. 1, with Endeavour’s STS-134 mission targeted for liftoff on Feb. 26, 2011.