collectSpace /Robert Pearlman
Space shuttle Atlantis rolls over to the 52-story Vehicle Assembly Building at NASA's Kennedy Space Center in Florida on Tuesday. Atlantis is set to fly the last mission of the space shuttle program, STS-135, in July.
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updated 5/17/2011 5:23:56 PM ET 2011-05-17T21:23:56

Just one day after the shuttle Endeavour launched for the last time, its sister orbiter Atlantis is making one final trip from its processing facility to the giant building where it will be stacked for its very last launch.

Atlantis is scheduled to make its last climb to orbit on the STS-135 mission sometime in July. The shuttle will carry four astronauts and a cargo bay full of spare parts to the International Space Station.

Today's maneuver, called "rollover" in NASA parlance, began at a building called the Orbiter Processing Facility (OPF) here at Kennedy Space Center, where Atlantis has undergone inspections and maintenance since landing after its last voyage, the STS-132 mission, in May 2010.

From there, Atlantis traveled out on a giant 18-wheel transporter platform, where it paused to allow shuttle workers to take photos alongside it. The rollover holds emotional significance for the team of thousands of NASA civil servants and contractors who have worked on Atlantis, many for the whole of its almost 26-year life.

collectSpace / Robert Pearlman
The crew of STS-135, NASA's final mission for its space shuttle program, pose in front of their spacecraft, space shuttle Atlantis, on Teusday. From left to right: mission specialist Rex Walheim, commander Chris Ferguson, pilot Doug Hurley and mission specialist Sandra Magnus.

Atlantis' four-astronaut STS-135 crew — commander Chris Ferguson, pilot Doug Hurley and mission specialists Sandy Magnus and Rex Walheim — also showed up to mark the occasion.

This afternoon Atlantis will roll in to the 52-story tall Vertical Assembly Building (VAB), and there, on Wednesday, it will be lifted and maneuvered into a vertical position to be joined with twin white solid rocket boosters and a giant orange external tank to become a full space shuttle.

With Atlantis' spaceflight, NASA will draw its 30-year space shuttle program to a close to begin building the next phase in American spaceflight: a vehicle that can take humans beyond low-Earth orbit to an asteroid and Mars.

After their last missions, NASA's three orbiters will be retired to museums. Atlantis will come back here to the Kennedy Space Center Visitor Complex, while Endeavour will go to the California Science Center in Los Angeles and Discovery will be sent to the Smithsonian National Air and Space Museum's Udvar-Hazy Center outside Washington, D.C.

You can follow Space.com senior writer Clara Moskowitz on Twitter @ClaraMoskowitz.Visit Space.com for complete coverage of Endeavour's final mission STS-134 or follow us @Spacedotcom and on Facebook.

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