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Space Shuttle Discovery arrives at International Space Station
AstronomyDiscovery is delivering six astronauts to the orbiting outpost, as well as station parts and supplies including the Permanent Multipurpose Module Leonardo, the ExPRESS Logistics Carrier-4 and Robonaut2, the first dexterous humanoid robot in space.

The docking, Discovery's 13th and final scheduled docking, occurred two minutes ahead of schedule, having been originally scheduled for 19:16 GMT today.

The hatch between the space shuttle and the ISS was opened at 20:16 UTC, after which the crew members of Expedition 26 welcomed the crew of STS-133 aboard the station. The crew then participated in a safety briefing with Expedition 26 commander Scott Kelly, while Shuttle Flight Director Bryan Lunney took part in a mission status briefing on the ground which began at 20:50 UTC.

Later on today, crew members Nicole Stott and Michael Barratt are scheduled to move the ExPRESS Logistics Carrier-4 from the payload bay using the shuttle's robotic arm to the station's own robot arm for placement on the exterior of the orbital laboratory.

There was a delay in the docking mechanism's ability to make a seal between the two spacecraft during docking operations, so activities occurring later on in the day, including the transfer of ELC-4, may be delayed. This was primarily because of a mis-alignment between the docking systems of the shuttle and station due to gravitational effects. The entire delay took up approximately 40 minutes.

During Discovery's approach to the station earlier on today, the crew of Expedition 26 took pictures of the shuttle's underside from the station's windows in order to assist in analysis of the heat shield of the spacecraft.

NASA officials are debating whether or not to extend the mission an additional day for a photo shoot of the International Space Station, as it is currently host to six docked spacecraft from the United States, Russia, Europe, and Japan. A decision regarding this possibility is expected on Tuesday.

STS-133 is Space Shuttle Discovery's 39th and final scheduled mission into space and the program's 35th mission to the ISS, as well as the 133rd in the entire Shuttle Program. There are two flights remaining before the retirement of the fleet that are still in planning: STS-134 and STS-135.
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