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NAVIGATION SATELLITE LAUNCHED

An advanced navigation satellite was launched this week aboard the US Air Force's new 128-foot-tall Delta 2 rocket. The satellite, which contains an atomic clock with an error rate of one second every 300,000 years, was designed to provide information on longitude, latitude, and altitude.

The Delta 2 is the first of three new space boosters the Air Force ordered built to carry national security payloads after the space shuttle Challenger exploded in 1986.

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