Space shuttle Discovery's astronauts steered closer to the international space station for a Sunday linkup, while checking their ship for any signs of launch damage.
The space shuttle Discovery sits on launch pad 39-A before sunrise Friday Aug. 28, 2009 at the... The space shuttle Discovery sits on launch pad 39-A before sunrise Friday Aug. 28, 2009 at the Kennedy Space Center in Cape Canaveral, Fla. Seven astronauts are scheduled to liftoff late this evening on a trip to the international space station. (AP Photo/Terry Renna) (AP)
The routine survey began early Saturday evening and lasted well into the night.
NASA officials say no fuel tank debris was observed hitting Discovery during Friday's midnight liftoff. But the shuttle's most vulnerable areas — the wings and nose — still needed to be checked with lasers and cameras on a boom attached to the robot arm. The images were beamed down for analysis.
In addition, the shuttle's underside will be photographed in detail by the space station residents Sunday night, right before the two craft meet.
A hole in the wing brought down Columbia six years ago. Ever since, NASA has been vigilant in seeking out indications of serious launch damage.
Discovery is loaded with supplies for the space station, now home to six astronauts. Once the seven shuttle fliers arrive, it will make for a record-tying crowd.
"It's great to be back in space," Discovery's commander, Rick Sturckow, said Saturday afternoon.
"Micro G is great," rookie astronaut Jose Hernandez noted in his first Twitter update from space. The Mexican-American grew up in a migrant worker family and applied for 12 straight years to become an astronaut, before getting picked in 2004. "Settling in and realizing my dream," he wrote.
Discovery's supply run will leave the space station well stocked; the shuttle is hauling about 17,000 pounds of equipment and science experiments. Six mice, part of a bone loss study, will move in for a three-month stay. So will astronaut Nicole Stott, the replacement for an astronaut who has been at the orbiting complex for more than a month.
Stott will help put together a brand new $5 million treadmill flying up on Discovery that will expand the space station's gym. The treadmill, currently in more than 100 pieces, is named after Comedy Central's Stephen Colbert. Earlier this year, he won an online vote for naming rights to a space station room, but NASA picked the name Tranquility instead and offered him the running machine.
Launch of Space Shuttle Discovery. 
Space Shuttle Discovery has successfully launched from Kennedy Space Center in Florida on mission STS-128.  Discovery took off at 11:59 p.m. (EDT) for a 13-day mission to the International Space Station (ISS).

The shuttle's payload consists of a Multi-Purpose Logistics Module or 'Leonardo' and a Lightweight Multi-Purpose Experiment Support Structure Carrier. The treadmill named for comedian Stephen Colbert also is aboard Discovery. Colbert had previously won a contest to have one of the modules named after him, but officials at NASA decided on the name Tranquility.

"Space Shuttle Discovery completed a flawless ascent into orbit Friday night to begin a two-day chase of the International Space Station," said NASA in a statement on their website.

After flying up on Discovery, astronaut Nicole Stott will trade places with station resident Tim Kopra, who went into space last month aboard Space Shuttle Endeavour.