LOS ANGELES, California (AP) -- NASA has delayed the launch of an unmanned spacecraft to the moon to scout for potential landing sites for astronauts.
NASA plans to land astronauts on the moon in 2020.
The moon craft is the first step in NASA's program to send astronauts back to the moon and beyond.
The Lunar Reconnaissance Orbiter was supposed to blast off from Cape Canaveral, Florida, in early December aboard an Atlas V rocket. But the launch was pushed back after NASA agreed to swap with the Air Force, which will fly a prototype space drone.
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