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NASA spacecraft has roamed billions of miles — but hasn't reached the 'edge'

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NASA 's New Horizons probe is 60 times farther from the sun than Earth .

The probe has reached the outer edge of the solar system's Kuiper Belt , a disk beyond Neptune of countless comets and thousands of tiny ice worlds.

Scientists had expected the spacecraft to arrive at the edge about 1 billion miles ago .

The new finding could mean the spacecraft has a longer journey ahead.