Russia's space agency postponed the docking of a cargo ship with the International Space Station on Tuesday because of problems with the unmanned spacecraft.
The Progress M-27M was launched Tuesday from the Baikonur Cosmodrome in Kazakhstan and was scheduled to dock six hours later.
But Roscosmos said Mission Control was having trouble getting data from the spacecraft and decided to postpone the docking at least until Thursday.
Russian state news agencies, citing sources in the space industry, said two antennas of the docking system had failed to unfold. They also reported that the Progress fell short of its designated orbit due to a problem in the operation of one of the rocket's stages.
A duty officer at Mission Control confirmed to the Associated Press that they were not getting enough data regarding the spacecraft's antennas and solar panels.
The Progress is carrying about 2.5 tons of cargo, including food and fuel, to the orbiting station and its six-person crew from Russia, the United States and Italy.
The cargo ship also is delivering a copy of the Banner of Victory, the banner raised over the Reichstag in Berlin by victorious Soviet soldiers in 1945. Russia is planning extensive celebrations for the 70th anniversary of the victory over Nazi Germany in World War II.