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NASA’s return to the moon after 25 years will have to wait at least another day.

An unmanned Athena rocket was supposed to blast off with the Lunar Prospector spacecraft by the light of a first moon Monday night. But last-minute trouble with the Air Force radar needed to track the rocket forced NASA to delay the launch.

If NASA does not launch Prospector on Tuesday, it will have to wait until early February for the most fuel-efficient route to the moon.

Among the highlights of the $63 million mission–searching for frozen water at the shadowy lunar poles. Humans last visited the moon in December 1972.