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The U.S. space shuttle Discovery has landed in Florida, ending a resupply and maintenance mission to the International Space Station. Its successful flight means the space agency NASA can finally resume construction of the station.

Shuttle Discovery landing at the Kennedy Space Center
Discovery's safe landing is an obvious relief to NASA, which was forced to halt assembly of the half-built space station more than three years ago when the shuttle Columbia disintegrated upon re-entry into the atmosphere.

Discovery, roaring like any other airplane, glided smoothly onto a runway at the Kennedy Space Center in Florida.

After landing, shuttle commander Steve Lindsey inspected the spacecraft and declared it free of damage, after its nearly nine million-kilometer journey.

Shuttle Discovery commander Steve Lindsey
"This is my fourth flight, and I've done four walk-arounds, and I've never seen a vehicle that looked as clean as this one did," said Steve Lindsey.

That is important to NASA, because it worked more than three years to ensure that shuttles suffer as little damage as possible from the kind of launch debris that doomed Columbia. That orbiter burned up when searing atmospheric gases entered a hole in its wing, caused by hard foam insulation that broke away from the external fuel tank during liftoff and hit it.