?WASHINGTON, March 3 (Reporter Ren Haijun) NASA announced that SpaceX Dragon cargo spacecraft arrived at the International Space Station (ISS) successfully took place on the morning of. Space Agency, said space station astronaut EST 5:31 (18:31 GMT), the use of robotic arm catch the "dragon" is successful, and more than three hours after its fixed node cabin on the space station "harmonious" docking hatch between the spacecraft and the space station will be open on the 4th. "Dragon" spacecraft was originally planned to dock with the space station on the 2nd, but shortly after the launch, the group pod propulsion is only one group in the run. Although the problem has finally been fixed, but the spacecrafts solar panels open time about two hours later than the scheduled time, the docking with the space station has also been postponed. NASA said, "Dragon" spacecraft is expected to dock with the space station for 22 days. The flight Dragon spacecraft to transport supplies to the station. "Dragon" spacecraft launch vehicle in October last year for the first time in the shipping process, there have been abnormal, leading to a test satellite failed to enter orbit in the Earths atmosphere, and eventually completely burnt. In addition, the test flight in May last year, the spacecraft sensor failure led to its docking with the space station two hours later. Space Exploration Technologies Space Agency signed a contract worth $ 1.6 billion, 12 cargo spacecraft will launch space station. Other companies in the United States - Orbital Sciences Corporation plans to test-fired commercial spacecraft to the space station earlier this year, the company with valuable $ 1.9 billion Space Agency signed the contract. Currently, the "Dragon" spacecraft is the only cargo spacecraft returned to Earth from the space station security. Russia "coalition" manned spacecraft brought back from the space station, only a small amount of objects cargo spacecraft "Progress" cargo spacecraft, as well as Europe, Japan returns to the atmosphere when burned. Retired to "Dragon" spacecraft lifted off for the first time, the United States needs to rely on Russia to transport personnel and cargo to the space station since the space shuttle in 2011. To change this situation, encourage private sector development and from the space station, "NASA Space bus. SpaceX Dragon spacecraft being refined, three or four years to achieve manned flight.
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